Instruction/ maintenance manual of the product YZ125N1 Yamaha
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5MV -28199-10 LIT -1 1626-14-36 PAN YZ125N1 YZ1 2 5N1 OWNER’S SER VICE MANUAL 5MV-10 00.6.13 0:53 PM y[W 1 (2,1).
5MV-10 00.6.13 0:53 PM y[W 2 (1,1).
YZ125N1 OWNER’S SERVICE MANUAL © 2000 by Y amaha Motor Corporation, U.S.A. 1st Edition, June 2000 All rights reserved. Any reprinting or unauthorized use without the written permission of Y amaha Motor Corporation U.S.A. is expressly prohibited. Printed in Japan P/N.
EC020000 INTRODUCTION Congratulations on your purchase of a Y amaha YZ series. This model is the culmination of Y amaha’s vast experience in the production of pacesetting racing machines. It represents the highest grade of craftsmanship and reliability that have made Y amaha a leader .
Yamaha Motor Corporation, U.S.A. hereby warrants to the origi- nal retail purchaser that the following components equipped on new Yamaha YZ or WR motorcycles purchased from an autho- rized Yamaha moto.
EC040001 IMPORT ANT NOTICE THIS MACHINE IS DESIGNED STRICTL Y FOR COMPETITION USE, ONL Y ON A CLOSED COURSE. It is illegal for this machine to be op- erated on any public street, road, or highway . Off-road use on public lands may also be illegal. Please check local regulations before riding.
5. GASOLINE IS HIGHL Y FLAMMABLE. Always turn off the engine while refuel- ing. T ake care to not spill any gasoline on the engine or exhaust system. Never refuel in the vicinity of an open flame, or while smoking.
EC050000 TO THE NEW OWNER This manual will provide you with a good basic understanding of features, operation, and basic maintenance and inspection items of this ma- chine. Please read this manual carefully and completely before operating your new machine.
EC080000 HOW T O USE THIS MANUAL EC081000 P ARTICULARL Y IMPORT ANT IN FORMA TION Q The Safety Alert Symbol means A TTENTION! BECOME ALERT! YOUR SAFETY IS IN- VOL VED! w Failure to follow W ARNING instructions could re- sult in severe injury or death to the machine op- erator , a bystander , or a person inspecting or re- pairing the machine.
EC083000 MANUAL FORMA T All of the procedures in this manual are organized in a sequential, step-by-step format. The informa- tion has been complied to provide the mechanic with an easy to read, handy reference that contains comprehensive explanations of all disassembly , repair , assembly , and inspection operations.
EC085002 ILLUSTRA TED SYMBOLS (Refer to the illustration) Illustrated symbols 1 to 7 are designed as thumb tabs to indicate the chapter ’s number and content.
ENGINE CHASSIS ELECTRICAL TUNING REGULAR INSPECTION AND ADJUSTMENTS SPECIFICA TIONS EC090000 INDEX GENERAL INFORMA TION GEN INFO 1 2 3 4 5 6 7 SPEC INSP ADJ ENG CHAS ELEC TUN 5MV-9-10-0 6/13/00 3:11 P.
EC0A0000 CONTENTS CHAPTER 1 GENERAL INFORMA TION DESCRIPTION ............................................1-1 MACHINE IDENTIFICA TION ......................1-2 IMPORT ANT INFORMA TION .....................1-3 CHECKING OF CONNECTION ..................1-6 SPECIAL TOOLS .
CHAPTER 4 ENGINE SEA T , FUEL T ANK AND SIDE COVERS .....................................................4-1 EXHAUST PIPE AND SILENCER ..............4-3 RADIA TOR ..................................................4-4 CARBURETOR AND REED V AL VE ......
CHAPTER 6 ELECTRICAL ELECTRICAL COMPONENTS AND WIRING DIAGRAM .....................................6-1 IGNITION SYSTEM .....................................6-2 CHAPTER 7 TUNING ENGINE .......................................................7-1 CHASSIS .
1-1 GEN INFO DESCRIPTION EC100000 GENERAL INFORMA TION EC110000 DESCRIPTION 1 Clutch lever 2 ”ENGINE STOP” button 3 Front brake lever 4 Throttle grip 5 Radiator cap 6 Fuel tank cap 7 Kick starter .
1-2 GEN INFO MA CHINE IDENTIFICA TION EC120001 MA CHINE IDENTIFICA TION There are two significant reasons for knowing the serial number of your machine: 1. When ordering parts, you can give the num- ber to your Y amaha dealer for positive iden- tification of the model you own.
1-3 GEN INFO IMPOR T ANT INFORMA TION EC130000 IMPOR T ANT INFORMA TION EC131010 PREP ARA TION FOR REMO V AL AND DISASSEMBL Y 1. Remove all dirt, mud, dust, and foreign ma- terial before removal and disassembly . When washing the machine with high pres- sured water , cover the parts as follows.
1-4 GEN INFO IMPOR T ANT INFORMA TION EC133000 GASKETS, OIL SEALS AND O-RINGS 1. All gaskets, oil seals, and O-rings should be replaced when an engine is overhauled. All gasket surfaces, oil seal lips, and O-rings must be cleaned. 2. Properly oil all mating parts and bearings during reassembly .
1-5 GEN INFO IMPOR T ANT INFORMA TION EC136000 CIRCLIPS 1. All circlips should be inspected carefully be- fore reassembly . Always replace piston pin clips after one use. Replace distorted cir- clips. When installing a circlip 1 , make sure that the sharp-edged corner 2 is positioned opposite to the thrust 3 it receives.
1-6 GEN INFO CHECKING OF CONNECTION EC1C0001 CHECKING OF CONNECTION Dealing with stains, rust, moisture, etc. on the connector . 1. Disconnect: 9 Connector 2. Dry each terminal with an air blower . 3. Connect and disconnect the connector two or three times.
1-7 GEN INFO SPECIAL T OOLS EC140001 SPECIAL T OOLS The proper special tools are necessary for complete and accurate tune-up and assembly . Using the correct special tool will help prevent damage caused by the use of improper tools or improvised tech- niques.
1-8 GEN INFO SPECIAL T OOLS P ar t number T ool name / How to use IIIustration YU-24460-01, 90890-01325 Radiator cap tester YU-24460-01 90890-01325 YU-33984, 90890-01352 Adapter YU-33984 90890-01352 These tools are used for checking the cooling system.
1-9 GEN INFO CONTR OL FUNCTIONS EC150000 CONTR OL FUNCTIONS EC151000 “ENGINE ST OP” BUTT ON The “ENGINE STOP” button 1 is located on the left handlebar .
1-10 GEN INFO CONTR OL FUNCTIONS EC156000 FRONT BRAKE LEVER The front brake lever 1 is located on the right handlebar . Pull it toward the handlebar to acti- vate the front brake. EC157000 REAR BRAKE PED AL The rear brake pedal 1 is located on the right side of the machine.
1-11 GEN INFO CONTR OL FUNCTIONS EC15R001 DET A CHABLE SIDEST AND This sidestand 1 is used to support only the machine when standing or transporting it. w 9 Never appl y additional for ce to the side- stand. 9 Remove this sidestand bef ore starting out.
1-12 GEN INFO FUEL AND ENGINE MIXING OIL EC160050 FUEL AND ENGINE MIXING OIL Mix oil with the gas at the ratio specified below . Always use fresh, name-brand gasoline, and mix the oil and gas the day of the race. Do not use premix that is more than a few hours old.
1-13 GEN INFO ST ARTING AND BREAK-IN EC190000 ST ARTING AND BREAK-IN c C Before starting the machine, perform the chec ks in the pre-operation check list. w Never start or run the engine in a closed area. The exhaust fumes are poisonous; they can cause loss of consciousness and death in a very shor t time.
1-14 GEN INFO ST ARTING AND BREAK-IN EC194001 BREAK-IN PROCEDURES 1. Before starting the engine, fill the fuel tank with a break-in oil-fuel mixture as follows. 2. Perform the pre-operation checks on the machine. 3. Start and warm up the engine. Check the idle speed, and check the operation of the controls and the “ENGINE STOP” button.
1-15 GEN INFO ST ARTING AND BREAK-IN c C 9 After the break-in or before eac h race, you must c heck the entire machine f or loose fit- tings and fasteners as per “T ORQUE- CHECK POINTS”. Tighten all such fastener s as required. 9 When any of the f ollowing parts have been replaced, they m ust be broken in.
1-16 GEN INFO T ORQUE-CHECK POINTS EC1A0012 T ORQUE-CHECK POINTS Frame construction Frame to rear frame Combined seat and tank Fuel tank to frame Engine mounting Frame to engine Steering Steering shaf.
1-17 GEN INFO CLEANING AND ST ORA GE EC1B0000 CLEANING AND ST ORA GE EC1B1000 CLEANING Frequent cleaning of your machine will enhance its appearance, maintain good overall perfor- mance, and extend the life of many components. 1. Before washing the machine, block off the end of the exhaust pipe to prevent water from entering.
1-18 GEN INFO CLEANING AND ST ORA GE EC1B2001 ST ORA GE If your machine is to be stored for 60 days or more, some preventive measures must be taken to avoid deterioration. After cleaning the ma- chine thoroughly , prepare it for storage as fol- lows: 1.
2-1 SPEC GENERAL SPECIFICA TIONS Model name: YZ125LC (EUROPE) YZ125N1 (USA) YZ125(N) (CDN, AUS, NZ, ZA) Model code number: 5MV1 (USA, CDN, ZA) 5MV2 (EUROPE) 5MV4 (AUS, NZ) Dimensions: USA, CDN, ZA EUROPE AUS, NZ Overall length 2,139 mm 2,136 mm 2,139 mm (84.
2-2 SPEC GENERAL SPECIFICA TIONS Carburetor: T ype/Manufacturer TMX χ 38SS/MIKUNI Spark plug: T ype/Manufacturer BR9EG/NGK Gap 0.5~0.6 mm (0.020~0.024 in) Clutch type: Wet, multiple-disc T ransmission: Primary reduction system Gear Primary reduction ratio 64/19 (3.
2-3 SPEC MAINTENANCE SPECIFICA TIONS Item Standard Limit Cylinder head: Combustion chamber capacity 10.2 cm 3 … (0.359 Imp oz, 0.345 US oz) W arp limit … 0.03 mm (0.0012 in) Cylinder: Bore size 54.000~54.014 mm 54.1 mm (2.130 in) (2.1260~2.1265 in) T aper limit … 0.
2-4 SPEC MAINTENANCE SPECIFICA TIONS Item Standard Limit T ransmission: Main axle deflection limit … 0.01 mm (0.0004 in) Drive axle deflection limit … 0.01 mm (0.0004 in) Shifter: Shifting type Cam drum and guide bar … Guide bar bending limit … 0.
2-5 SPEC MAINTENANCE SPECIFICA TIONS Part to be tightened Thread size Q'ty T ightening torque Nm m•kg ft•lb Spark plug M14 × 1.25 1 20 2.0 14 Cylinder head (nut) M 8 × 1.25 5 28 2.8 20 (stud) M 8 × 1.25 5 13 1.3 9.4 Cylinder (nut) M 8 × 1.
2-6 SPEC MAINTENANCE SPECIFICA TIONS Part to be tightened Thread size Q'ty T ightening torque Nm m•kg ft•lb Exhaust pipe M 6 × 1.0 2 12 1.2 8.7 Exhaust pipe stay (front) M 6 × 1.0 1 12 1.2 8.7 Exhaust pipe stay (rear) M 6 × 1.0 1 12 1.2 8.
2-7 SPEC MAINTENANCE SPECIFICA TIONS EC212201 CHASSIS Item Standard Limit Steering system: Steering bearing type T aper roller bearing … Front suspension: USA, CDN, ZA EUROPE AUS, NZ Front fork travel 300 mm (1 1.8 in) ← … Fork spring free length 460 mm (18.
2-8 SPEC MAINTENANCE SPECIFICA TIONS Item Standard Limit Wheel: Front wheel type Spoke wheel … Rear wheel type Spoke wheel … Front rim size/Material 21 × 1.60/Aluminum … Rear rim size/Material 19 × 1.85/Aluminum … Rim runout limit: Radial … 2.
2-9 SPEC MAINTENANCE SPECIFICA TIONS NO TE: 1. First, tighten the ring nut approximately 38 Nm (3.8 m•kg, 27 ft•lb) by using the ring nut wrench, then loosen the ring nut one turn.
2-10 SPEC MAINTENANCE SPECIFICA TIONS Part to be tightened Thread size Q'ty T ightening torque Nm m•kg ft•lb Rear brake master cylinder and frame M 6 × 1.0 2 10 1.0 7.2 Rear brake reservoir tank and frame M 6 × 1.0 1 7 0.7 5.1 Rear brake hose union bolt (caliper) M10 × 1.
2-11 SPEC MAINTENANCE SPECIFICA TIONS EC212300 ELECTRICAL Part to be tightened Thread size Q’ty T ightening torque Nm m•kg ft•lb Stator M 6 × 1.0 3 8 0.8 5.8 Rotor M10 × 1.25 1 33 3.3 24 Ignition coil M 6 × 1.0 2 7 0.7 5.1 Item Standard Limit Ignition system: Ignition timing (B.
2-12 SPEC GENERAL T ORQUE SPECIFICA TIONS/ DEFINITION OF UNITS This chart specifies torque for standard faste- ners with standard I.S.O. pitch threads. T orque specifications for special components or assem- blies are included in the applicable sections of this book.
2-13 SPEC CABLE R OUTING DIA GRAM EC240000 CABLE R OUTING DIA GRAM 1 Brake hose 2 Fuel tank breather hose 3 Cable guide 4 Clamp 5 “ENGINE STOP” button lead 6 Throttle cable 7 Air vent hose (right).
2-14 SPEC CABLE R OUTING DIA GRAM 1 Brake hose holder 2 Master cylinder 3 Brake hose 4 Hose guide 5 CDI unit band 6 CDI unit 7 High tension cord 8 Ignition coil 9 Cable guide 0 Radiator breather hose .
2-15 SPEC CABLE R OUTING DIA GRAM A Install the brake hose so that its pipe portion directs as show and lightly touches the projection on the master cylinder. B Pass the “ENGINE STOP” button lead in the middle of the clutch holder. C Pass the clutch cable in front of the throttle cable.
3-1 MAINTENANCE INTERV ALS INSP ADJ EC300000 REGULAR INSPECTION AND ADJUSTMENTS EC310051 MAINTENANCE INTERV ALS The following schedule is intended as a general guide to maintenance and lubrication.
3-2 MAINTENANCE INTERV ALS INSP ADJ Item Remarks COOLING SYSTEM Check coolant level and leakage ●● Check radiator cap operation ● Replace coolant ● Every two years Inspect hoses ● OUTSIDE NUTS AND BOLTS Refer to “STARTING Retighten ●● AND BREAK-IN” section in the CHAPTER 1.
3-4 PRE-OPERA TION INSPECTION AND MAINTENANCE INSP ADJ EC320000 PRE-OPERA TION INSPECTION AND MAINTENANCE Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition. Before using this machine, check the following points.
3-5 ENGINE/COOLANT LEVEL INSPECTION/ COOLANT REPLACEMENT INSP ADJ EC350000 ENGINE EC351011 COOLANT LEVEL INSPECTION w Do not remove the radiator cap 1 1 , drain bolt and hoses when the engine and radia- tor are hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury .
3-6 COOLANT REPLACEMENT INSP ADJ c C T ake care so that coolant does not splash on painted surfaces. If it splashes, wash it away with water . 1. Place a container under the engine. 2. Remove: 9 Coolant drain bolt 1 3. Remove: 9 Radiator cap Drain the coolant completely .
3-7 RADIA TOR CAP INSPECTION INSP ADJ c C 9 Do not mix more than one type of ethyl- ene glycol antifreeze containing corro- sion inhibitors for aluminum engine. 9 Do not use water containing impurities or oil. 7. Install: 9 Radiator cap Start the engine and warm it up for a sev- eral minutes.
3-8 RADIA TOR CAP OPENING PRESSURE INSPECTION/ COOLING SYSTEM INSPECTION INSP ADJ EC356002 RADIA TOR CAP OPENING PRESSURE INSPECTION 1. Attach: 9 Radiator cap tester 1 and adapter 2 NOTE: Apply water on the radiator cap seal. 3 Radiator cap 2. Apply the specified pressure.
3-9 CLUTCH ADJUSTMENT INSP ADJ NOTE: 9 Do not apply pressure more than specified pressure. 9 Radiator should be filled fully . 4. Inspect: 9 Pressure Impossible to maintain the specified pres- sure for 10 seconds → Repair . 9 Radiator 1 9 Radiator hose joint 2 Coolant leakage → Repair or replace.
3-10 THROTTLE CABLE ADJUSTMENT/ THROTTLE LUBRICA TION INSP ADJ EC35A001 THROTTLE CABLE ADJUSTMENT 1. Check: 9 Throttle grip free play a Out of specification → Adjust. 2. Adjust: 9 Throttle grip free play EC35S002 THROTTLE LUBRICA TION 1. Remove: 9 Cap cover 1 9 Throttle cable cap 2 2.
3-11 AIR FIL TER CLEANING INSP ADJ 3. Install: 9 Throttle cable cap 9 Cap cover EC35G040 AIR FIL TER CLEANING NOTE: Proper air filter maintenance is the biggest key to preventing premature engine wear and dam- age.
3-12 TRANSMISSION OIL LEVEL CHECK INSP ADJ 3. Inspect: 9 Air filter element Damage → Replace. 4. Apply: 9 Foam-air-filter oil or engine mixing oil T o the element.
3-13 TRANSMISSION OIL REPLACEMENT INSP ADJ 3. Check: 9 T ransmission oil level EC35K002 TRANSMISSION OIL REPLACEMENT 1. Start the engine and warm it up for several minutes and wait for five minute. 2. Place the machine on a level place and hold it on upright position by placing the suitable stand under the engine.
3-14 PILOT AIR SCREW ADJUSTMENT INSP ADJ 4. Remove: 9 Oil drain bolt 1 9 Oil filler cap 2 Drain the transmission oil. 5. Install: 9 Aluminum washer 9 Oil drain bolt 1 6. Fill: 9 T ransmission oil 7. Check: 9 Oil leakage 8. Check: 9 T ransmission oil level 9.
3-15 IDLE SPEED ADJUSTMENT/MUFFLER INSPECTION/ SILENCER FIBER REPLACEMENT INSP ADJ EC35M010 IDLE SPEED ADJUSTMENT 1. Start the engine and thoroughly warm it up. 2. Adjust: 9 Idle speed EC35P010 MUFFLER INSPECTION 1. Inspect: 9 O-ring 1 Damage → Replace.
3-16 SILENCER FIBER REPLACEMENT INSP ADJ 5. Install: 9 Bolt (fiber) 1 9 Silencer 2 9 Bolt [silencer (front)] 3 9 Bolt [silencer (rear)] 4 9 Side cover (right) 9 Seat 10 Nm (1.0 m•kg, 7.2 ft•lb) 12 Nm (1.2 m•kg, 8.7 ft•lb) 7 Nm (0.7 m•kg, 5.1 ft•lb) 2.
3-17 CHASSIS/BRAKE SYSTEM AIR BLEEDING INSP ADJ EC360000 CHASSIS EC361012 BRAKE SYSTEM AIR BLEEDING w Bleed the brake system if: 9 The system has been disassembled. 9 A brake hose has been loosened or removed. 9 The brake fluid is very low . 9 The brake operation is faulty .
3-18 FRONT BRAKE ADJUSTMENT INSP ADJ 3. Install: 9 Protector (rear brake) 9 Diaphragm 9 Master cylinder cap EC362040 FRONT BRAKE ADJUSTMENT 1. Check: 9 Brake lever position a 2. Adjust: 9 Brake lever position NOTE: If bleeding is difficult, it may be necessary to let the brake fluid system stabilize for a few hours.
3-19 REAR BRAKE ADJUSTMENT/ FRONT BRAKE P AD INSPECTION AND REPLACEMENT INSP ADJ EC365080 FRONT BRAKE P AD INSPECTION AND REPLACEMENT 1. Inspect: 9 Brake pad thickness a Out of specification → Replace as a set. 2. Replace: 9 Brake pad Brake pad thickness a a : Standard 4.
3-20 FRONT BRAKE P AD INSPECTION AND REPLACEMENT INSP ADJ 9 Loosen the pad pin 2 . 9 Remove the brake hose holder 3 and caliper 4 from the front fork. 9 Remove the pad pin and brake pads 5 . 9 Connect the transparent hose 6 to the bleed screw 7 and place the suitable con- tainer under its end.
3-21 REAR BRAKE P AD INSPECTION AND REPLACEMENT INSP ADJ 3. Inspect: 9 Brake fluid level Refer to “BRAKE FLUID LEVEL INSPECTION” section. 4. Check: 9 Brake lever operation A softy or spongy feeling → Bleed brake system. Refer to “BRAKE SYSTEM AIR BLEED- ING” section.
3-22 REAR BRAKE P AD INSPECTION AND REPLACEMENT INSP ADJ 9 Remove the pad pin 6 and brake pads 7 . 9 Connect the transparent hose 8 to the bleed screw 9 and place the suitable con- tainer under its end. 9 Loosen the bleed screw and push the caliper piston in.
3-23 REAR BRAKE P AD INSULA TOR INSPECTION BRAKE FLUID LEVEL INSPECTION INSP ADJ EC36b000 REAR BRAKE P AD INSULA TOR INSPECTION 1. Remove: 9 Brake pad Refer to “ REAR BRAKE P AD INSPEC- TION AND REPLACEMENT” section. 2. Inspect: 9 Rear brake pad insulator 1 Damage → Replace.
3-24 SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION INSP ADJ EC368000 SPROCKETS INSPECTION 1. Inspect: 9 Sprocket teeth a Excessive wear → Replace. NOTE: Replace the drive, driven sprockets and drive chain as a set. EC369002 DRIVE CHAIN INSPECTION 1. Remove: 9 Master link clip 9 Joint 1 9 Drive chain 2 2.
3-25 DRIVE CHAIN SLACK ADJUSTMENT INSP ADJ EC36A060 DRIVE CHAIN SLACK ADJUSTMENT 1. Elevate the rear wheel by placing the suit- able stand under the engine.
3-26 FRONT FORK INSPECTION INSP ADJ 3. Adjust: 9 Drive chain slack EC36C000 FRONT FORK INSPECTION 1. Inspect: 9 Front fork smooth action Operate the front brake and stroke the front fork. Unsmooth action/oil leakage → Repair or replace. Drive chain slack adjustment steps: 9 Loosen the axle nut 1 and locknuts 2 .
3-27 FRONT FORK OIL SEAL AND DUST SEAL CLEANING/ FRONT FORK REBOUND DAMPING FORCE ADJUSTMENT INSP ADJ Minimum 20 clicks out (from maximum position) EC36D001 FRONT FORK OIL SEAL AND DUST SEAL CLEANING 1. Remove: 9 Protector 9 Dust seal 1 NOTE: Use a thin screw driver , and be careful not to damage the inner fork tube and dust seal.
3-28 FRONT FORK COMPRESSION DAMPING FORCE ADJUSTMENT INSP ADJ c C Do not force the adjuster past the minimum or maximum extent of adjustment. The ad- juster may be damaged. w Always adjust each front fork to the same setting. Uneven adjustment can cause poor handling and loss of stability .
3-29 REAR SHOCK ABSORBER INSPECTION INSP ADJ 9 ST ANDARD POSITION: This is the position which is back by the spe- cific number of clicks from the fully turned-in position. c C Do not force the adjuster past the minimum or maximum extent of adjustment.
3-30 REAR SHOCK ABSORBER SPRING PRELOAD ADJUSTMENT INSP ADJ EC36M013 REAR SHOCK ABSORBER SPRING PRELOAD ADJUSTMENT 1. Elevate the rear wheel by placing the suit- able stand under the engine. 2. Remove: 9 Rear frame 3. Loosen: 9 Locknut 1 4. Adjust: 9 Spring preload By turning the adjuster 2 .
3-31 REAR SHOCK ABSORBER REBOUND DAMPING FORCE ADJUSTMENT INSP ADJ EC36N014 REAR SHOCK ABSORBER REBOUND DAMPING FORCE ADJUSTMENT 1. Adjust: 9 Rebound damping force By turning the adjuster 1 . 9 ST ANDARD POSITION: This is the position which is back by the specif- ic number of clicks from the fully turned-in posi- tion.
3-32 REAR SHOCK ABSORBER LOW COMPRESSION DAMPING FORCE ADJUSTMENT INSP ADJ EC36c000 REAR SHOCK ABSORBER LOW COMPRESSION DAMPING FORCE ADJUSTMENT 1. Adjust: 9 Low compression damping force By turning the adjuster 1 . 9 ST ANDARD POSITION: This is the position which is back by the specif- ic number of clicks from the fully turned-in posi- tion.
3-33 REAR SHOCK ABSORBER LOW COMPRESSION DAMPING FORCE ADJUSTMENT INSP ADJ EC36d000 REAR SHOCK ABSORBER HIGH COMPRESSION DAMPING FORCE ADJUSTMENT 1. Adjust: 9 High compression damping force By turning the adjuster 1 . 9 ST ANDARD POSITION: This is the position which is back by the specif- ic number of turns from the fully turned-in posi- tion.
3-34 TIRE PRESSURE CHECK/SPOKES INSPECTION AND TIGHTENING/WHEEL INSPECTION INSP ADJ EC36Q000 TIRE PRESSURE CHECK 1. Measure: 9 T ire pressure Out of specification → Adjust. NOTE: 9 Check the tire while it is cold. 9 Loose bead stoppers allow the tire to slip off its position on the rim when the tire pressure is low .
3-35 STEERING HEAD INSPECTION AND ADJUSTMENT INSP ADJ 2. Inspect: 9 Bearing free play Exist play → Replace. EC36U013 STEERING HEAD INSPECTION AND ADJUSTMENT 1. Elevate the front wheel by placing a suitable stand under the engine. 2. Check: 9 Steering shaft Grasp the bottom of the forks and gently rock the fork assembly back and forth.
3-36 STEERING HEAD INSPECTION AND ADJUSTMENT INSP ADJ 9 Loosen the ring nut one turn. 9 Retighten the ring nut using the ring nut wrench. w A void over-tightening. 9 Check the steering shaft by turning it lock to lock. If there is any binding, remove the steering shaft assembly and inspect the steering bearings.
3-37 LUBRICA TION INSP ADJ EC36a042 LUBRICA TION T o ensure smooth operation of all components, lubricate your machine during setup, after break- in, and after every race.
3-38 ELECTRICAL/SP ARK PLUG INSPECTION INSP ADJ EC370000 ELECTRICAL EC371001 SP ARK PLUG INSPECTION 1. Remove: 9 Spark plug 2. Inspect: 9 Electrode 1 Wear/Damage → Replace. 9 Insulator color 2 Normal condition is a medium to light tan color . Distinctly different color → Check the engine condition.
3-39 IGNITION TIMING CHECK INSP ADJ EC372051 IGNITION TIMING CHECK 1. Remove: 9 Cylinder head Refer to “CYLINDER HEAD, CYLINDER AND PISTON” section in the CHAPTER 4. 9 Crankcase cover (left) 2. Attach: 9 Dial gauge 1 9 Dial gauge stand 2 3. Rotate the magneto rotor 1 until the piston reaches top dead center (TDC).
3-40 IGNITION TIMING CHECK INSP ADJ 7. Adjust: 9 Ignition timing Adjustment steps: 9 Loosen the screws (stator) 1 . 9 Align the punch mark on the rotor with punch mark on the stator 2 by moving the stator . 9 T ighten the screws (stator). Screw (stator): 8 Nm (0.
4-1 ENG SEA T , FUEL T ANK AND SIDE COVERS 4 EC400000 ENGINE EC4R0000 SEA T , FUEL T ANK AND SIDE COVERS Extent of removal Order Part name Q’ty Remarks SEAT, FUEL TANK AND SIDE COVERS REMOVAL Preparation for Turn the fuel cock to “OFF”. removal Disconnect the fuel hose.
4-2 ENG SEA T , FUEL T ANK AND SIDE COVERS 4 EC4R3000 REMOV AL POINTS EC413101 Side cover 1. Remove: 9 Side cover (left and right) 1 c C Be sure to remove the seat before remov- ing the side cover . If you remove the side cover with force without removing the seat, the panel 2 2 (on the inside) may contact the air cleaner case and come off.
4-3 ENG EXHAUST PIPE AND SILENCER EC4S0000 EXHAUST PIPE AND SILENCER Extent of removal Order Part name Q’ty Remarks EXHAUST PIPE AND SILENCER REMOVAL Preparation for Side cover (right) Refer to “SEAT, FUEL TANK AND removal SIDE COVERS” section.
4-4 ENG RADIA TOR Extent of removal Order Part name Q’ty Remarks RADIATOR REMOVAL Preparation for Drain the coolant. Refer to “COOLANT REPLACEMENT“ removal section in the CHAPTER 3. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS” section.
4-5 ENG RADIA TOR EC456000 HANDLING NOTE w Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious in- jury .
4-6 ENG RADIA TOR EC455000 ASSEMBL Y AND INST ALLA TION EC445341 Radiator 1. Install: 9 Radiator breather hose 1 9 Radiator hose 3 2 9 Radiator hose 1 3 T o radiator (right) 4 . NOTE: Install the radiator hose 3 with its shorter pro- truding length a from the protector 5 on the ra- diator side.
4-7 ENG CARBURETOR AND REED V AL VE EC460000 CARBURETOR AND REED V AL VE Extent of removal Order Part name Q’ty Remarks CARBURETOR AND REED VALVE REMOVAL Preparation for Fuel tank Refer to “SEAT, FUEL TANK AND removal SIDE COVERS” section. 1 Clamp (carburetor joint) 2 Loosen the screws (carburetor joint).
4-8 ENG CARBURETOR AND REED V AL VE EC468000 CARBURETOR DISASSEMBL Y Extent of removal Order Part name Q’ty Remarks CARBURETOR DISASSEMBLY 1 Mixing chamber top 1 2 Throttle valve 1 Refer to “REMOVAL POINTS”.
4-9 ENG CARBURETOR AND REED V AL VE EC466030 HANDLING NOTE c C Do not disassemble the venturi block 1 1 and main nozzle 2 2 because it will cause a drop in carburetor performance.
4-10 ENG CARBURETOR AND REED V AL VE EC464200 Needle valve 1. Inspect: 9 Needle valve 1 9 V alve seat 2 Grooved wear a → Replace. Dust b → Clean. NOTE: Always replace the needle valve and valve seat as a set. EC464301 Throttle valve 1. Check: 9 Free movement Stick → Repair or replace.
4-11 ENG CARBURETOR AND REED V AL VE Measurement and adjustment steps: 9 Remove the drain plug. 9 Connect the fuel level gauge adapter 2 and fuel level gauge 1 to the float chamber . Fuel level gauge adapter: YM-01470/90890-01470 Fuel level gauge: YM-1312-A/90890-01312 9 Hold the fuel level gauge vertically next to the float chamber mating surface.
4-12 ENG CARBURETOR AND REED V AL VE 9 V alve stopper height b Out of specification → Adjust stopper/ Replace valve stopper . EC465000 ASSEMBL Y AND INST ALLA TION EC465190 Reed valve 1. Install: 9 Reed valve 1 9 Stopper (reed valve) 2 9 Screw (reed valve) 3 NOTE: 9 Install the reed valve with the reed valve bend- ing as shown.
4-13 ENG CARBURETOR AND REED V AL VE 2. Install: 9 Reed valve assembly 1 9 Reed valve spacer 2 NOTE: Install the reed valve spacer with its wider con- tact surface side a to the right. 3. Install: 9 Carburetor joint 1 9 Bolt (carburetor joint) 2 EC4652C2 Carburetor 1.
4-14 ENG CARBURETOR AND REED V AL VE 3. Install: 9 Main jet holder 1 9 Main jet 2 9 Pilot jet 3 9 V alve seat 4 9 Screw (valve seat) 5 4. Install: 9 Needle valve 1 9 Float 2 9 Float pin 3 9 Screw (float pin) 4 9 Needle jet cover 5 NOTE: 9 After installing the needle valve to the float, in- stall them to the carburetor .
4-15 ENG CARBURETOR AND REED V AL VE 7. Install: 9 Throttle cable 1 9 Mixing chamber top 2 9 Spring (throttle valve) 3 9 Ring 4 9 Throttle valve 5 NOTE: 9 While compressing the spring, connect the throttle cable. 9 Align the projection a on the ring with the groove b in the needle holder 6 .
4-16 ENG CARBURETOR AND REED V AL VE 2. T ighten: 9 Screw (air filter joint) 1 9 Screw (carburetor joint) 2 3. Clamp: 9 Air vent hose 1 9 Overflow hose 2 Refer to “CABLE ROUTING DIAGRAM” section in the CHAPTER 2. 4. Adjust: 9 Idle speed Refer to “IDLE SPEED ADJUSTMENT” section in the CHAPTER 3.
4-17 ENG CYLINDER HEAD, CYLINDER AND PISTON EC470000 CYLINDER HEAD, CYLINDER AND PISTON EC478000 CYLINDER HEAD AND CYLINDER Extent of removal Order Part name Q’ty Remarks CYLINDER HEAD AND CYLINDER REMOVAL Preparation for Seat and fuel tank Refer to “SEAT, FUEL TANK AND removal SIDE COVERS” section.
4-18 ENG CYLINDER HEAD, CYLINDER AND PISTON EC478100 PISTON AND POWER V AL VE Extent of removal Order Part name Q’ty Remarks PISTON AND POWER VALVE REMOVAL 1 Piston pin clip 2 2 Piston pin 1 3 Piston 1 Refer to “REMOVAL POINTS”.
4-19 ENG CYLINDER HEAD, CYLINDER AND PISTON EC473000 REMOV AL POINTS EC473210 Push rod 1. Remove: 9 Bolt (push rod) 1 9 Push rod 2 NOTE: Set the collar 3 included in owner ’s tool kit to remove the bolt (push rod). EC473401 Piston and piston ring 1.
4-20 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474000 INSPECTION EC474101 Cylinder head 1. Remove: 9 Carbon deposits Use a rounded scraper 1 . NOTE: T ake care to avoid damaging the spark plug threads. Do not use a sharp instrument. Avoid scratching the aluminum.
4-21 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474301 Piston 1. Remove: 9 Carbon deposits From the piston crown a and ring groove b . 2. Inspect: 9 Piston wall Score marks → Repair or replace. 3. Measure: 9 Piston skirt diameter Use micrometer 1 . Measure the specific distance a from the bottom edge.
4-22 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474402 Piston pin and small end bearing 1. Inspect: 9 Piston pin 9 Small end bearing Signs of heat discoloration → Replace. 2. Measure: 9 Piston pin outside diameter Use micrometer 1 . Out of limit → Replace.
4-23 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474502 Piston ring 1. Install: 9 Piston ring Into the cylinder . Push the ring with the piston crown. 2. Measure: 9 End gap Use a thickness gauge 1 . Out of limit → Replace. 3. Measure: 9 Side clearance Use a thickness gauge 1 .
4-24 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474700 Combination of piston and cylinder 1. Check: 9 Cylinder mark a 2. Check: 9 Piston mark a 3. Combination: Combine the piston and cylinder by the fol- lowing chart. NOTE: When you purchase a cylinder , you cannot des- ignate its size.
4-25 ENG CYLINDER HEAD, CYLINDER AND PISTON EC474830 Power valve 1. Inspect: 9 Power valve 1,2 1 Wear/Damage → Replace. Carbon deposits → Remove. 9 Link lever 2 9 V alve shaft 3 9 Collar 4 Wear/Damage → Replace. 9 Spring 5 Broken → Replace. EC474901 Power valve hole on cylinder 1.
4-26 ENG CYLINDER HEAD, CYLINDER AND PISTON 2. Install: 9 Spring 1 9 Link lever 2 9 Collar 3 9 V alve shaft 4 9 Bolt (link lever) 5 NOTE: 9 Install the spring to the link lever , and then to the cylinder . 9 Install the spring with its stopper portion a fac- ing inward.
4-27 ENG CYLINDER HEAD, CYLINDER AND PISTON EC475233 Piston ring and piston 1. Install: 9 Piston ring 1 NOTE: 9 T ake care not to scratch the piston or damage the piston ring. 9 Align the piston ring gap with the pin 2 . 9 After installing the piston ring, check the smooth movement of it.
4-28 ENG CYLINDER HEAD, CYLINDER AND PISTON 3. Install: 9 Nut (cylinder) 1 NOTE: T ighten the nuts in stage, using a crisscross pat- tern. 4. Install: 9 Collar 1 9 Push rod 2 9 Plain washer 3 9 Bolt (push rod) 4 NOTE: 9 Set the collar 5 included in owner's tool kit to install the bolt (push rod).
4-29 ENG CYLINDER HEAD, CYLINDER AND PISTON 7. Install: 9 Cylinder head 1 9 Copper washer 2 9 Nut (cylinder head) 3 NOTE: T ighten the nuts (cylinder head) in stage, using a crisscross pattern. 8. Install: 9 Engine bracket 1 9 Bolt (engine bracket) 2 9 CDI unit bracket 3 9 Engine mounting bolt (upper) 4 9.
4-30 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR Extent of removal Order Part name Q’ty Remarks CLUTCH PLATE AND FRICTION PLATE REMOVAL Preparation for Drain the transmission oil. Refer to “TRANSMISSION OIL REPLACE- removal MENT “ section in the CHAPTER 3.
4-31 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR EC498100 PRIMAR Y DRIVEN GEAR Extent of removal Order Part name Q’ty Remarks PRIMARY DRIVEN GEAR REMOVAL 1 Nut (clutch boss) 1 Use special tool. 2 Lock washer 1 Refer to “REMOVAL POINTS”. 3 Clutch boss 1 4 Plain washer [ φ 34 mm (1.
4-32 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR EC493000 REMOV AL POINTS EC483211 Clutch boss 1. Remove: 9 Nut 1 9 Lock washer 2 9 Clutch boss 3 NOTE: Straighten the lock washer tab and use the clutch holding tool 4 , 5 to hold the clutch boss. å For USA and CDN ∫ Except for USA and CDN EC494000 INSPECTION EC484100 Clutch housing and boss 1.
4-33 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR EC484500 Friction plate 1. Measure: 9 Friction plate thickness Out of specification → Replace friction plate as a set. Measure at all four points. EC484600 Clutch plate 1. Measure: 9 Clutch plate warpage Out of specification → Replace clutch plate as a set.
4-34 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR EC495000 ASSEMBL Y AND INST ALLA TION EC495240 Clutch 1. Install: 9 Thrust plate [ φ 36 mm (1.42 in)] 1 9 Spacer 2 9 Bearing 3 9 Primary driven gear 4 NOTE: Apply the transmission oil on the spacer , bearing and primary driven gear inner circumference.
4-35 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR 5. Install: 9 Friction plate 1 1 9 Clutch plate 2 9 Friction plate 2 3 NOTE: 9 Install the clutch plates and friction plates alter- nately on the clutch boss, starting with a friction plate and ending with a friction plate.
4-36 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR EC495121 Push lever 1. Install: 9 T orsion spring 1 9 Push lever 2 T o push lever axle 3 . NOTE: 9 Install the push lever with its 5 mark a down- ward. 9 T emporarily install the torsion spring and push lever at this point.
4-37 ENG CLUTCH AND PRIMAR Y DRIVEN GEAR 4. Install: 9 Plain washer 1 9 Circlip 2 5MV-9-10-4B 6/12/00 8:40 PM Page 18.
4-38 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR Extent of removal Order Part name Q’ty Remarks RPIMARY DRIVE GEAR REMOVAL Preparation for Drain the transmission oil. Refer to “TRANSMISSION OIL REPLACE- removal MENT“ section in the CHAPTER 3.
4-39 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR EC4C8100 KICK AXLE AND SHIFT SHAFT Extent of removal Order Part name Q’ty Remarks KICK AXLE AND SHIFT SHAFT REMOVAL 1 Kick idle gear 1 2 kick axle assembly 1 Refer to “REMOVAL POINTS”.
4-40 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR EC4C3000 REMOV AL POINTS EC483111 Primary drive gear 1. Loosen: 9 Bolt (primary drive gear) 1 NOTE: Place an aluminum plate a between the teeth of the primary drive gear 2 and driven gear 3 . EC4B3101 Kick axle assembly 1.
4-41 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR EC4B4300 Kick gear clip 1. Measure: 9 Kick clip friction force Out of specification → Replace. Use a spring gauge 1 . EC4B4400 Shift shaft 1. Inspect: 9 Shift shaft 1 Bend/Damage → Replace. 9 Spring 2 Broken → Replace.
4-42 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR EC4C5000 ASSEMBL Y AND INST ALLA TION EC4C5120 Stopper lever 1. Install: 9 T orsion spring 1 9 Stopper lever 2 9 Spacer 3 9 Bolt (stopper lever) 4 NOTE: 9 Align the stopper lever roller with the slot on segment.
4-43 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR 4. Install: 9 Bolt (shift guide) 1 EC4C5301 Shift shaft 1. Install: 9 Roller 1 9 Shift shaft 2 NOTE: Apply the transmission oil on the roller and shift shaft. EC4B5302 Kick axle assembly 1. Install: 9 Kick gear 1 9 Plain washer 2 9 T orsion spring 3 T o kick axle 4 .
4-44 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR 4. Hook: 9 T orsion spring 1 NOTE: T urn the torsion spring clockwise and hook into the proper hole a in the crankcase. EC4C5402 Kick idle gear 1. Install: 9 Circlip 1 9 Kick idle gear 2 9 Plain washer 3 NOTE: 9 Apply the transmission oil on the kick idle gear inner circumference.
4-45 ENG KICK AXLE, SHIFT SHAFT AND PRIMAR Y DRIVE GEAR 5. Install: 9 Crankcase cover (right) 1 NOTE: 9 Position the rack a on the push rod backward. 9 Mesh the governor gear 2 , and impeller shaft gear 3 with primary drive gear 4 . 6. Install: 9 Bolt [crankcase cover (right)] 1 NOTE: T ighten the bolts in stage, using a crisscross pattern.
4-46 ENG YPVS GOVERNOR Extent of removal Order Part name Q’ty Remarks YPVS GOVERNOR REMOVAL Preparation for Crankcase cover (right) Refer to “KICK AXLE, SHIFT SHAFT AND removal PRIMARY DRIVE GEAR” section. 1 Governor assembly 1 2 Dowel pin 1 Refer to “REMOVAL POINTS”.
4-47 ENG YPVS GOVERNOR EC4K3000 REMOV AL POINTS EC4K3100 Governor 1. Remove: 9 Dowel pin 1 NOTE: While compressing the spring, remove the dowel pin. EC4K4000 INSPECTION EC4K4100 Governor groove 1. Inspect: 9 Plain washer 1 9 Collar 2 Wear/Damage → Replace.
4-48 ENG YPVS GOVERNOR 2. Install: 9 Ball 1 9 Retainer 2 T o governor shaft 3 . NOTE: Apply the transmission oil on the retainer and ball. 3. Install: 9 Dowel pin 1 NOTE: 9 While compressing the spring, install the dowel pin. 9 Make sure the dowel pin fits into the groove a in the retainer .
4-49 ENG W A TER PUMP Extent of removal Order Part name Q’ty Remarks WATER PUMP DISASSEMBLY Preparation for Crankcase cover (right) Refer to “KICK AXLE, SHIFT SHAFT AND removal PRIMARY DRIVE GEAR” section. 1 Water pump housing cover 1 2 Impeller 1 3 Plain washer 1 R efer to “REMOVAL POINTS”.
4-50 ENG W A TER PUMP EC4G3000 REMOV AL POINTS EC4G3110 Impeller shaft 1. Remove: 9 Impeller 1 9 Plain washer 2 9 Impeller shaft 3 NOTE: Hold the impeller shaft on its width across the flats a with spanners, etc.
4-51 ENG W A TER PUMP EC444300 Impeller shaft gear 1. Inspect: 9 Gear teeth a Wear/Damage → Replace. EC4H4600 Bearing 1. Inspect: 9 Bearing 1 Rotate inner race with a finger . Rough spot/Seizure → Replace. EC444400 Oil seal 1. Inspect: 9 Oil seal 1 Wear/Damage → Replace.
4-52 ENG W A TER PUMP EC4G5220 Impeller shaft 1. Install: 9 Impeller shaft 1 NOTE: 9 T ake care so that the oil seal lip is not dam- aged or the spring does not slip off its position. 9 When installing the impeller shaft, apply the lithium soap base grease on the oil seal lip and impeller shaft.
4-53 ENG CDI MAGNETO Extent of removal Order Part name Q’ty Remarks CDI MAGNETO REMOVAL Preparation for Seat and fuel tank Refer to “SEAT, FUEL TANK AND removal SIDE COVERS” section. Bolt [Radiator (left)] Refer to “RADIATOR” section. Disconnect the CDI magneto lead.
4-54 ENG CDI MAGNETO EC4L3000 REMOV AL POINTS EC4L3102 Rotor 1. Remove: 9 Nut (rotor) 1 9 Plain washer 2 Use the rotor holding tool 3 . 2. Remove: 9 Rotor 1 Use the flywheel puller 2 . NOTE: When installing the flywheel puller , turn it coun- terclockwise.
4-55 ENG CDI MAGNETO 2. Install: 9 Woodruf f key 1 9 Rotor 2 NOTE: 9 Clean the tapered portions of the crankshaft and rotor . 9 When installing the woodruff key , make sure that its flat surface a is in parallel with the crankshaft center line b . 9 When installing the rotor , align the keyway c of the rotor with the woodruff key .
4-56 ENG CDI MAGNETO 7. Connect: 9 CDI magneto lead 1 Refer to “CABLE ROUTING DIAGRAM” section in the CHAPTER 2. 8. Install: 9 Gasket [crankcase cover (left)] 9 Crankcase cover (left) 1 9 Screw [crankcase cover (left)] 2 NOTE: T ighten the screws in stage, using a crisscross pattern.
4-57 ENG ENGINE REMOV AL Extent of removal Order Part name Q’ty Remarks ENGINE REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS” section.
4-58 ENG ENGINE REMOV AL Extent of removal: 1 Engine removal Extent of removal Order Part name Q’ty Remarks 1 Chain cover 1 2 Nut (drive sprocket) 1 3 Lock washer 1 Refer to “REMOVAL POINTS”.
4-59 ENG ENGINE REMOV AL EC4M3000 REMOV AL POINTS EC4F3100 Drive sprocket 1. Remove: 9 Nut (drive sprocket) 1 9 Lock washer 2 NOTE: 9 Straighten the lock washer tab. 9 Loosen the nut while applying the rear brake. 2. Remove: 9 Drive sprocket 1 9 Drive chain 2 NOTE: Remove the drive sprocket together with the dri- ve chain.
4-60 ENG ENGINE REMOV AL EC4M5000 ASSEMBL Y AND INST ALLA TION EC4M5171 Engine installation 1. Install: 9 Engine 1 Install the engine from right side. 9 Pivot shaft 2 9 Engine mounting bolt (lower) 3 .
4-61 ENG ENGINE REMOV AL 2. Install: 9 Lock washer 1 9 Nut (drive sprocket) 2 NOTE: T ighten the nut while applying the rear brake. 3. Bend the lock washer tab to lock the nut. 4. Install: 9 Chain cover 1 9 Screw (chain cover) 2 5 Nm (0.5 m•kg, 3.6 ft•lb) 60 Nm (6.
4-62 ENG CRANKCASE AND CRANKSHAFT Extent of removal Order Part name Q’ty Remarks CRANKCASE AND CRANKSHAFT REMOVAL Preparation for Engine Refer to “ ENGINE REMOVAL” section. removal Piston Refer to “ CYLINDER HEAD, CYLINDER AND PISTON ” section.
4-63 ENG CRANKCASE AND CRANKSHAFT EC4N3000 REMOV AL POINTS EC4N3100 Segment 1. Remove: 9 Bolt (segment) 1 9 Segment 2 NOTE: T urn the segment counterclockwise until it stops and loosen the bolt. EC4N3211 Crankcase 1. Remove: 9 Crankcase (right) 1 Use the crankcase separating tool 2 and crankcase separating bolt 3 .
4-64 ENG CRANKCASE AND CRANKSHAFT EC4N3301 Crankshaft 1. Remove: 9 Crankshaft 1 Use the crankcase separating tool 2 and crankcase separating bolt 3 . c C Do not use a hammer to drive out the crankshaft. EC4N3401 Crankshaft bearing 1. Remove: 9 Bearing 1 NOTE: 9 Remove the bearing from the crankcase by pressing its inner race as shown in å .
4-65 ENG CRANKCASE AND CRANKSHAFT Standard <Limit> Runout 0.03 mm 0.05 mm limit: (0.0012 in) (0.0020 in) Small end 0.8~1.0 mm 2.0 mm free play: (0.031~0.039 in) (0.08 in) Side 0.20~0.70 mm — clearance: (0.008~0.028in) Crank 55.90~55.95 mm — width: (2.
4-66 ENG CRANKCASE AND CRANKSHAFT EC4N5102 Oil seal 1. Install: 9 Oil seal (left) 1 9 Oil seal (right) 2 NOTE: 9 Apply the lithium soap base grease on the oil seal lip. 9 Install the oil seal with its manufacture’s marks or numbers facing outward. EC4N5272 Crankshaft 1.
4-67 ENG CRANKCASE AND CRANKSHAFT 2. Check: 9 Shifter operation 9 T ransmission operation Unsmooth operation → Repair . 3. Apply: 9 Sealant On the crankcase (right) 1 NOTE: Clean the contacting surface of crankcase (left and right) before applying the sealant.
4-68 ENG CRANKCASE AND CRANKSHAFT 6. Install: 9 Holder 1 9 Bolt (holder) 2 7. Install: 9 Segment 1 9 Bolt (segment) 2 NOTE: 9 When installing the segment onto the shift cam 3 , align the punch mark a with the dowel pin b . 9 T urn the segment clockwise until it stops and tighten the bolt.
4-69 ENG TRANSMISSION, SHIFT CAM AND SHIFT FORK Extent of removal Order Part name Q’ty Remarks TRANSMISSION, SHIFT CAM AND SHIFT FORK REMOVAL Preparation for Engine Refer to “ ENGINE REMOVAL” section. removal Separate the crankcase. Ref er t o “CRANKCASE AND CRANK SHAFT ” section.
4-70 ENG TRANSMISSION, SHIFT CAM AND SHIFT FORK EC4H3000 REMOV AL POINTS EC4H3200 T ransmission 1. Remove: 9 Main axle 1 9 Drive axle 2 NOTE: 9 T ap lightly on the transmission drive axle with a soft hammer to remove. 9 Remove assembly carefully . Note the position of each part.
4-71 ENG TRANSMISSION, SHIFT CAM AND SHIFT FORK EC4H4801 Shift fork, shift cam and segment 1. Inspect: 9 Shift fork 1 Wear/Damage/Scratches → Replace. 2. Inspect: 9 Shift cam 1 9 Segment 2 9 Guide bar 3 Bend/Wear/Damage → Replace. 3. Check: 9 Shift fork movement On its guide bar .
4-72 ENG TRANSMISSION, SHIFT CAM AND SHIFT FORK 2. Install: 9 2nd wheel gear (28T) 1 9 6th wheel gear (24T) 2 9 4th wheel gear (27T) 3 9 3rd wheel gear (26T) 4 9 5th wheel gear (26T) 5 9 1st wheel gear (30T) 6 T o drive axle 7 . NOTE: 9 Apply the molybdenum disulfide oil on the 1st, 2nd, 3rd and 4th wheel gears inner circumfer- ence.
4-73 ENG TRANSMISSION, SHIFT CAM AND SHIFT FORK EC4H5331 Shift cam and shift fork 1. Install: 9 Shift fork 1 (L) 1 9 Shift fork 2 2 9 Shift fork 3 (R) 3 NOTE: 9 Mesh the shift fork #1 (L) with the 6th wheel gear 4 and #3 (R) with the 5th wheel gear 6 on the drive axle.
5-1 CHAS FRONT WHEEL AND REAR WHEEL 5 Extent of removal Order Part name Q’ty Remarks FRONT WHEEL REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. 1 Hose cover 1 2 Bolt (brake hose holder) 2 Only loosening.
5-2 CHAS FRONT WHEEL AND REAR WHEEL 5 EC598100 REAR WHEEL Extent of removal: 1 Rear wheel removal 2 Wheel bearing removal 3 Brake disc removal Extent of removal Order Part name Q’ty Remarks REAR WHEEL REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine.
5-3 CHAS FRONT WHEEL AND REAR WHEEL EC593000 REMOV AL POINTS EC523101 Rear wheel 1. Remove: 9 Wheel 1 NOTE: Push the wheel forward and remove the drive chain 2 . EC513201 Wheel bearing (if necessary) 1. Remove: 9 Bearing 1 NOTE: Remove the bearing using a general bearing puller 2 .
5-4 CHAS FRONT WHEEL AND REAR WHEEL EC514200 Wheel axle 1. Measure: 9 Wheel axle bends Out of specification → Replace. Use the dial gauge 1 . NOTE: The bending value is shown by one half of the dial gauge reading. w Do not attempt to straighten a bent axle.
5-5 CHAS FRONT WHEEL AND REAR WHEEL EC595000 ASSEMBL Y AND INST ALLA TION EC595101 Front wheel 1. Install: 9 Bearing (left) 1 9 Spacer 2 9 Bearing (right) 3 9 Oil seal 4 NOTE: 9 Apply the lithium soap base grease on the bearing and oil seal lip when installing.
5-6 CHAS FRONT WHEEL AND REAR WHEEL 5. Install: 9 Wheel axle 1 NOTE: Apply the lithium soap base grease on the wheel axle. 6. Install: 9 Nut (wheel axle) 1 7. T ighten: 9 Bolt (axle holder) 1 NOTE: Before tightening the bolt, fit the wheel axle to the axle holder by stroking the front fork several times with the front brake applied.
5-7 CHAS FRONT WHEEL AND REAR WHEEL EC5251A0 Rear wheel 1. Install: 9 Bearing (right) 1 9 Circlip 2 9 Spacer 3 9 Bearing (left) 4 9 Oil seal 5 NOTE: 9 Apply the lithium soap base grease on the bearing and oil seal lip when installing. 9 Install the bearing with seal facing outward.
5-8 CHAS FRONT WHEEL AND REAR WHEEL 3. Install: 9 Driven sprocket 1 9 Bolt (driven sprocket) 2 9 Plain washer (driven sprocket) 3 9 Nut (driven sprocket) 4 NOTE: T ighten the nuts in stage, using a crisscross pat- tern. 4. Install: 9 Collar 1 NOTE: Apply the lithium soap base grease on the oil seal lip.
5-9 CHAS FRONT WHEEL AND REAR WHEEL 8. Install: 9 Chain puller (right) 1 9 Plain washer 2 9 Nut (wheel axle) 3 NOTE: T emporarily tighten the nut (wheel axle) at this point. 9. Adjust: 9 Drive chain slack a Refer to “DRIVE CHAIN SLACK ADJUSTMENT” section in the CHAPTER 3.
5-10 CHAS FRONT BRAKE AND REAR BRAKE Extent of removal Order Part name Q’ty Remarks FRONT BRAKE REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Drain the brake fluid. Refer to “REMOVAL POINTS”. 1 Hose cover 1 2 Brake hose holder 1 3 Bolt (brake hose holder) 2 Only loosening.
5-11 CHAS FRONT BRAKE AND REAR BRAKE EC5A8100 REAR BRAKE Extent of removal Order Part name Q’ty Remarks REAR BRAKE REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Rear wheel Refer to “FRONT WHEEL AND REAR WHEEL” section.
5-12 CHAS FRONT BRAKE AND REAR BRAKE Extent of removal Order Part name Q’ty Remarks CALIPER DISASSEMBLY AB 1 Pad pin 1 1 2 Brake pad 2 2 3 Pad support 1 1 4 Caliper piston 2 1 Refer to “REMOVAL POINTS”. 5 Dust seal 2 1 Refer to “REMOVAL POINTS”.
5-13 CHAS FRONT BRAKE AND REAR BRAKE Extent of removal Order Part name Q’ty Remarks MASTER CYLINDER DISASSEMBLY 1 Master cylinder cap 1 2 Diaphragm 1 3 Master cylinder boot 1 4 Circlip 1 Use a long nose circlip pliers.
5-14 CHAS FRONT BRAKE AND REAR BRAKE EC5A3000 REMOV AL POINTS EC5A3100 Brake fluid 1. Remove: [Front] 9 Master cylinder cap 1 [Rear] 9 Reservoir tank cap 1 9 Protector NOTE: Do not remove the diaphragm. A Front B Rear 2. Connect the transparent hose 1 to the bleed screw 2 and place a suitable contain- er under its end.
5-15 CHAS FRONT BRAKE AND REAR BRAKE EC533402 Piston seal kit 1. Remove: 9 Dust seal 1 9 Piston seal 2 NOTE: Remove the piston seals and dust seals by pushing them with a finger . c C Never attempt to pry out piston seals and dust seals. w Replace the piston seals and dust seals whenever a caliper is disassembled.
5-16 CHAS FRONT BRAKE AND REAR BRAKE EC534214 Caliper 1. Inspect: 9 Caliper cylinder inner surface a Wear/Score marks → Replace caliper as- sembly . A Front B Rear 2. Inspect: 9 Caliper piston 1 Wear/Score marks → Replace caliper piston assembly .
5-17 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: 9 Piston seal 1 9 Dust seal 2 w Always use new piston seals and dust seals. NOTE: Fit the piston seals and dust seals onto the slot on caliper correctly . A Front B Rear 3. Install: 9 Caliper piston 1 NOTE: Apply the brake fluid on the piston wall.
5-18 CHAS FRONT BRAKE AND REAR BRAKE 3. Install: 9 Brake hose holder 1 9 Caliper 2 9 Bolt (caliper) 3 NOTE: Fit the brake hose holder cut a over the projec- tion b on the front fork and clamp the brake hose. 4. T ighten: 9 Pad pin 4 5. Install: 9 Pad pin plug 5 EC5A5120 Rear caliper 1.
5-19 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: 9 Disc cover 1 9 Bolt (disc cover) 2 3. Install: 9 Copper washer 1 9 Brake hose 2 9 Union bolt 3 w Always use new copper washers. c C Install the brake hose to the caliper with the paint a a on the pipe facing the caliper and with the pipe contacting the caliper projection b b .
5-20 CHAS FRONT BRAKE AND REAR BRAKE EC5A5220 Master cylinder kit 1. Clean: 9 Master cylinder 9 Master cylinder kit Clean them with brake fluid. 2. Install: 9 Master cylinder cup (primary) 1 9 Master cylinder cup (secondary) 2 T o master cylinder piston 3 .
5-21 CHAS FRONT BRAKE AND REAR BRAKE 4. Install: [Front] 9 Master cylinder kit 1 9 Plain washer 2 9 Circlip 3 9 Master cylinder boot 4 T o master cylinder 5 . [Rear] 9 Master cylinder kit 1 9 Push rod 2 9 Circlip 3 9 Master cylinder boot 4 T o master cylinder 5 .
5-22 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: 9 Master cylinder 1 9 Bolt (master cylinder) 2 EC5A5400 Rear master cylinder 1. Install: 9 Reservoir hose 1 9 Reservoir tank 2 NOTE: Pass the reservoir hose into the hose guide. 10 Nm (1.0 m•kg, 7.2 ft•lb) 26 Nm (2.
5-23 CHAS FRONT BRAKE AND REAR BRAKE EC5A5911 Front brake hose 1. Install: 9 Brake hose 1 T o brake hose holder 2 . NOTE: Before tightening the bolt (brake hose holder), align the top a of the brake hose neck with the brake hose holder bottom b .
5-24 CHAS FRONT BRAKE AND REAR BRAKE EC5A5500 Rear brake hose 1. Install: 9 Copper washer 1 9 Brake hose 2 9 Union bolt 3 w Always use new copper washers. c C Install the brake hose so that its pipe por- tion a a directs as show and lightly touches the projection b b on the master cylinder .
5-25 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: 9 Brake hose holder 1 9 Screw (brake hose holder) 2 c C After installing the brake hose holders, make sure the brake hose does not contact the spring (rear shock absorber). If it does, correct its twist.
5-26 CHAS FRONT BRAKE AND REAR BRAKE 2. Air bleed: 9 Brake system Refer to “BRAKE SYSTEM AIR BLEED- ING” section in the CHAPTER 3. 3. Inspect: 9 Brake fluid level Fluid at lower level → Fill up. Refer to “BRAKE FLUID LEVEL INSPEC- TION” section in the CHAPTER 3.
5-27 CHAS FRONT FORK Extent of removal Order Part name Q’ty Remarks FRONT FORK REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Front wheel Refer to “FRONT WHEEL AND REAR WHEEL”section. Front caliper Refer to “FRONT BRAKE AND REAR BRAKE”section.
5-28 CHAS FRONT FORK Extent of removal Order Part name Q’ty Remarks FRONT FORK DISASSEMBLY 1 Cap bolt 1 Refer to “REMOVAL POINTS”. 2 Fork spring 1 Drain the folk oil.
5-29 CHAS FRONT FORK EC556000 HANDLING NOTE NOTE: The front fork requires careful attention. So it is recommended that the front fork be maintained at the dealers.
5-30 CHAS FRONT FORK EC553201 Inner tube 1. Remove: 9 Dust seal 1 9 Stopper ring 2 Using slotted-head screwdriver . c C T ake care not to scratch the inner tube. 2. Remove: 9 Inner tube 1 EC553311 Damper rod 1. Remove: 9 Base valve 1 9 Damper rod 2 NOTE: Use a damper rod holder 3 to lock the damper rod.
5-31 CHAS FRONT FORK EC554200 Base valve 1. Inspect: 9 V alve assembly 1 Wear/Damage → Replace. 9 O-ring 2 Damage → Replace. EC554400 Fork spring 1. Measure: 9 Fork spring free length a Out of specification → Replace. EC554502 Inner tube 1. Inspect: 9 Inner tube surface a Score marks → Repair or replace.
5-32 CHAS FRONT FORK EC554700 Cap bolt 1. Inspect: 9 Cap bolt 1 9 O-ring 2 9 Air bleed screw 3 Wear/Damage → Replace. EC555000 ASSEMBL Y AND INST ALLA TION EC5551A1 Front fork assembly 1. W ash the all parts in a clean solvent. 2. Install: 9 Damper rod 1 T o inner tube 2 .
5-33 CHAS FRONT FORK 5. Install: 9 Spring guide 1 9 Locknut 2 T o damper rod 3 . NOTE: 9 Install the spring guide with its cut a facing up- ward. 9 With its thread b facing upward, fully finger tighten the locknut onto the damper rod. 6. Install: 9 Dust seal 1 9 Stopper ring 2 9 Oil seal 3 9 Plain washer 4 9 Slide metal 5 T o inner tube 6 .
5-34 CHAS FRONT FORK 9. Install: 9 Slide metal 1 9 Plain washer 2 T o outer tube slot. NOTE: Press the slide metal into the outer tube with fork seal driver 3 . 10. Install: 9 Oil seal 1 NOTE: Press the oil seal into the outer tube with fork seal driver 2 .
5-35 CHAS FRONT FORK 13. Check: 9 Inner tube smooth movement T ightness/Binding/Rough spots → Repeat the steps 2 to 12. 14. Compress the front fork fully . 15. Fill: 9 Front fork oil Until outer tube top surface with recom- mended fork oil 1 . c C 9 Be sure to use recommended fork oil.
5-36 CHAS FRONT FORK 19. W ait ten minutes until the air bubbles have been removed from the front fork, and the oil has dispense evenly in system before setting recommended oil level.
5-37 CHAS FRONT FORK 23. Install: 9 Cushion rubber 1 9 W asher 2 9 Spacer 3 T o cap bolt 4 . NOTE: Install the cushion rubber with its smaller dia.end a facing the cap bolt. 21. Measure: 9 Distance a Out of specification → T urn into the locknut. 24.
5-38 CHAS FRONT FORK 2. T ighten: 9 Cap bolt 1 3. Adjust: 9 Front fork top end a 30 Nm (3.0 m•kg, 22 ft•lb) Front fork top end (standard) a a : 5 mm (0.20 in) 26. T ighten: 9 Cap bolt (locknut) 1 NOTE: 9 While compressing the fork spring, set the thin type spanners 2 between the spacer 3 and spring guide 4 .
5-39 CHAS FRONT FORK 7. Adjust: 9 Rebound damping force NOTE: T urn in the damping adjuster 1 finger-tight and then turn out to the originally set position. 4. T ighten: 9 Pinch bolt (handle crown) 1 9 Pinch bolt (under bracket) 2 c C Tighten the under bracket to specified torque.
5-40 CHAS HANDLEBAR Extent of removal Order Part name Q’ty Remarks Preparation for HANDLEBAR REMOVAL removal Number plate Remove the clamp portion only. 1 Clutch cable 1 Disconnect at the lever side. 2 Clutch lever holder 1 3 “ENGINE STOP” button 1 4 Master cylinder 1 Refer to “REMOVAL POINTS”.
5-41 CHAS HANDLEBAR Extent of removal: 1 Throttle disassembly Extent of removal Order Part name Q’ty Remarks THROTTLE DISASSEMBLY 1 Grip cap (lower) 1 2 Grip cap (upper) 1 3 Grip assembly 1 4 Grip (right) 1 Refer to “REMOVAL POINTS”. 5 Tube guide 1 1 EC5B8000 THROTTLE DISASSEMBL Y 4 Nm (0.
5-42 CHAS HANDLEBAR EC5B3000 REMOV AL POINTS EC5B3100 Master cylinder 1. Remove: 9 Master cylinder bracket 1 9 Master cylinder 2 c C 9 Do not let the master cylinder hang on the brake hose. 9 Keep the master cylinder cap side horizontal to prevent air from coming in.
5-43 CHAS HANDLEBAR 2. Install: 9 Grip cap (upper) 1 9 Grip cap (lower) 2 9 Bolt (grip cap) 3 NOTE: T emporarily tighten the bolts (grip cap). EC5B5210 Handlebar 1. Install: 9 Handlebar 1 9 Handlebar holder 2 9 Bolt (handlebar holder) 3 NOTE: 9 The upper handlebar holder should be installed with the punched mark a forward.
5-44 CHAS HANDLEBAR 4. Install: 9 Throttle cable 1 T o tube guide 2 . NOTE: Apply the lithium soap base grease on the throt- tle cable end and tube guide cable winding por- tion. 5. Install: 9 Roller 1 9 Collar 2 NOTE: 9 Apply the lithium soap base grease on the roller sliding surface.
5-45 CHAS HANDLEBAR 10. Install: 9 Bolt (grip cap) 1 w 9 Install the grip cap so that the gaps a a and b b between the bolt (grip cap) and brake lever 2 2 are equal. If you make a mistake in the grip cap installation position, the brake lever may contact the grip cap, resulting in poor brake performance.
5-46 CHAS HANDLEBAR 14. Clamp the clamp portion a of the number plate to the handlebar . 15. Insert the end of the fuel breather hose 1 into the hole of the number plate.
5-47 CHAS STEERING Extent of removal Order Part name Q’ty Remarks STEERING REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Number plate Handlebar Refer to “HANDLEBAR” section. Cable guide Front fender 1 Steering shaft nut 1 2 Front fork 2 Refer to “FRONT FORK” section.
5-48 CHAS STEERING EC563000 REMOV AL POINTS EC563202 Ring nut 1. Remove: 9 Ring nut 1 Use the ring nut wrench 2 . w Support the steering shaft so that it may not fall down. EC563300 Bearing (lower) 1. Remove: 9 Bearing (lower) 1 Use the floor chisel 2 .
5-49 CHAS STEERING EC564101 Bearing and ball race 1. W ash the bearings and ball races with a sol- vent. 2. Inspect: 9 Bearing 1 9 Ball race Pitting/Damage → Replace bearings and ball races as a set. Install the bearing in the ball races. Spin the bearings by hand.
5-50 CHAS STEERING 4. Install: 9 Plain washer 1 9 Ring nut 2 T ighten the ring nut using the ring nut wrench 3 . Refer to “STEERING HEAD INSPECTION AND ADJUSTMENT” section in the CHAP- TER 3. 5. Check the steering shaft by turning it lock to lock.
5-51 CHAS STEERING 9. After tightening the nut, check the steering for smooth movement. If not, adjust the steering by loosening the ring nut little by little. 10. Adjust: 9 Front fork top end a 1 1. T ighten: 9 Pinch bolt (handle crown) 1 9 Pinch bolt (under bracket) 2 c C Tighten the under bracket to specified torque.
5-52 CHAS SWINGARM Extent of removal Order Part name Q’ty Remarks SWINGARM REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Brake hose holder Refer to “FRONT BRAKE AND Rear caliper REAR BRAKE”section.
5-53 CHAS SWINGARM Extent of removal Order Part name Q’ty Remarks SWINGARM DISASSEMBLY 1 Cap 2 2 Relay arm 1 3 Connecting rod 1 4 Collar 2 5 Oil seal 2 6 Thrust bearing 2 7 Bush 2 8 Oil seal 8 9 Bearing 8 Refer to “REMOVAL POINTS”.
5-54 CHAS SWINGARM EC573000 REMOV AL POINTS EC573200 Bearing 1. Remove: 9 Bearing 1 NOTE: Install the bearing by pressing its outer race. EC574010 INSPECTION W ash the bearings, bushes, collars, and covers in a solvent.
5-55 CHAS SWINGARM EC575000 ASSEMBL Y AND INST ALLA TION EC575202 Bearing and oil seal 1. Install: 9 Bearing 1 9 Oil seal 2 T o swingarm. NOTE: 9 Apply the molybdenum disulfide grease on the bearing when installing. 9 Install the bearing by pressing it on the side hav- ing the manufacture's marks or numbers.
5-56 CHAS SWINGARM EC5751B1 Swingarm 1. Install: 9 Bush 1 9 Thrust bearing 2 9 Oil seal 3 9 Collar 4 T o swingarm 5 . NOTE: Apply the molybdenum disulfide grease on the bushes, thrust bearings and oil seal lips. 2. Install: 9 Collar 1 T o relay arm 2 .
5-57 CHAS SWINGARM 5. Install: 9 Relay arm 1 9 Bolt (relay arm) 2 9 Plain washer 3 9 Nut (relay arm) 4 T o swingarm. NOTE: 9 Apply the molybdenum disulfide grease on the bolt. 9 Do not tighten the nut yet. 6. Install: 9 Swingarm 1 9 Pivot shaft 2 NOTE: 9 Apply the molybdenum disulfide grease on the pivot shaft.
5-58 CHAS SWINGARM 10. T ighten: 9 Nut (connecting rod) 1 1 1. T ighten: 9 Nut (relay arm) 1 12. Install: 9 Cap 1 NOTE: Install the cap with its mark a facing forward. 13. Install: 9 Bolt [chain tensioner (lower)] 1 9 Plain washer 2 9 Collar 3 9 Chain tensioner 4 9 Nut [chain tensioner (lower)] 5 14.
5-59 CHAS REAR SHOCK ABSORBER Extent of removal Order Part name Q’ty Remarks REAR SHOCK ABSORBER REMOVAL Preparation for Hold the machine by placing the removal suitable stand under the engine. Seat Refer to “SEAT, FUEL TANK AND SIDE COVERS” section.
5-60 CHAS REAR SHOCK ABSORBER EC586000 HANDLING NOTE w This shock absorber is provided with a separate type tank filled with high-pressure nitrogen gas. T o prevent the danger of ex- plosion, read and understand the following information before handling the shock ab- sorber .
5-61 CHAS REAR SHOCK ABSORBER EC583000 REMOV AL POINTS EC583320 Bearing 1. Remove: 9 Stopper ring (upper bearing) 1 NOTE: Press in the bearing while pressing its outer race and remove the stopper ring. 2. Remove: 9 Upper bearing 1 NOTE: Remove the bearing by pressing its outer race.
5-62 CHAS REAR SHOCK ABSORBER EC585111 Spring (rear shock absorber) 1. Install: 9 Spring 1 9 Spring guide (upper) 2 9 Spring guide (lower) 3 2. T ighten: 9 Adjuster 1 EC585000 ASSEMBL Y AND INST ALLA TION EC585320 Bearing 1.
5-63 CHAS REAR SHOCK ABSORBER 3. Adjust: 9 Spring length (installed) a *For EUROPE NOTE: The length of the spring (installed) changes 1.5 mm (0.06 in) per turn of the adjuster . c C Never attempt to turn the adjuster beyond the maximum or minimum setting.
5-64 CHAS REAR SHOCK ABSORBER 3. Install: 9 Rear shock absorber 4. Install: 9 Bolt (rear shock absorber-frame) 1 9 Nut (rear shock absorber-frame) 2 NOTE: Apply the molybdenum disulfide grease on the bolt. 5. Install: 9 Plain washer 1 9 Bolt (rear shock absorber-relay arm) 2 NOTE: 9 Apply the molybdenum disulfide grease on the bolt.
6-1 ELEC ELECTRICAL COMPONENTS AND WIRING DIAGRAM 6 EC600000 ELECTRICAL EC610000 ELECTRICAL COMPONENTS AND WIRING DIAGRAM EC611000 ELECTRICAL COMPONENTS 1 “ENGINE STOP” button 2 Ignition coil 3 CDI unit 4 CDI magneto 5 Spark plug EC612000 WIRING DIAGRAM COLOR CODE B.
6-2 ELEC IGNITION SYSTEM 6 EC620000 IGNITION SYSTEM EC621002 INSPECTION STEPS Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure and for checking the spark plug which will not spark.
6-3 ELEC IGNITION SYSTEM EC622001 SP ARK GAP TEST 1. Disconnect the spark plug cap from spark plug. 2. Connect the dynamic spark tester 1 (igni- tion checker 2 ) as shown. 9 Spark plug cap 3 9 Spark plug 4 A For USA and CDN B Except for USA and CDN 3.
6-4 ELEC IGNITION SYSTEM EC626002 IGNITION COIL INSPECTION 1. Inspect: 9 Primary coil resistance Out of specification → Replace. 2. Inspect: 9 Secondary coil resistance Out of specification → Replace. NOTE: When inspecting the secondary coil resistance, remove the spark plug cap.
6-5 ELEC IGNITION SYSTEM EC627011 CDI MAGNETO INSPECTION 1. Inspect: 9 Pick-up coil resistance Out of specification → Replace. 2. Inspect: 9 Source coil 1 resistance Out of specification → Replace. 3. Inspect: 9 Source coil 2 resistance Out of specification → Replace.
7-1 TUN SETTING 7 EC700000 TUNING EC710000 ENGINE EC711001 Carburetor setting 9 The role of fuel is to cool the engine, and in the case of a 2-stroke engine, to lubricate the engine in addition to power generation. Accordingly , if a mixture of air and fuel is too lean, abnormal combustion will occur , and engine seizure may result.
7-2 TUN SETTING That is: 9 Higher temperature expands the air with its resultant reduced density . 9 Higher humidity reduces the amount of oxygen in the air by so much of the water vapor in the same air . 9 Lower atmospheric pressure (at a high altitude) reduces the density of the air .
7-3 TUN SETTING EC714060 Effect of setting parts in relation to throttle valve opening 1 Throttle valve opening 2 Full-open 3 Full-closed EC715002 Main jet adjustment The richness of air-fuel mixture with 1/2~4/4 throttle can be set by changing the main jet 1 .
7-4 TUN SETTING EC716001 Pilot air screw adjustment The richness of air-fuel mixture with full closed to 1/4 throttle can be set by turning the pilot air screw 1 . T urning in the pilot air screw will enrich the mix- ture at low speeds, and turning out it will lean out the mixture.
7-5 TUN SETTING EC718010 Jet needle groove position adjustment Should the engine be hard to run smoothly at intermediate speeds, the jet needle 1 must be adjusted. If the mixture is too rich or too lean at intermediate speed operation, irregular engine operation and poor acceleration will result.
7-6 TUN SETTING EC719071 Jet needle adjustment (For USA, CDN, ZA, AUS and NZ) On the carburetors used in the YZ125, the main nozzle is a non disassembly type, so it can not be replaced. Therefore, carburetor setting requires the change of the jet needle.
7-7 TUN SETTING EC719071 Jet needle adjustment (For EUROPE) On the carburetors used in the YZ125, the main nozzle is a non disassembly type, so it can not be replaced.
TUN 7-8 SETTING EC71B040 Relationship with throttle opening The flow of the fuel through the carburetor main system is controlled by the main jet and then, it is further regulated by the area between the main nozzle and the jet needle.
TUN 7-9 SETTING EC71Q000 Carburetor setting parts Part name Size Part number Main jet 1 1 Lean #420 137-14143-84 #430 137-14143-86 #440 137-14143-88 *(STD) #450 137-14143-90 (STD) #460 137-14143-92 #470 137-14143-94 #480 137-14143-96 Rich #490 137-14143-98 Pilot jet 2 2 Lean #20 4KM-14142-20 #22.
TUN 7-10 SETTING EC71C020 Road condition and examples of carburetor setting EC71D040 Examples of carburetor setting depending on symptom Symptom Setting Checking At full throttle Increase main jet calibration No. Discoloration of spark plug → Stall at high speeds (Gradually) If tan color, it is in good condition.
TUN 7-11 SETTING Symptom Setting Checking 0~1/4 throttle Use jet needle having a smaller Number of turns-back → * Hard breathing diameter. Correct properly Speed down Overflow from carburetor 0~1/4 throttle Use jet needle having a larger Poor acceleration diameter.
TUN 7-12 SETTING EC71M001 Change of the heat range of spark plugs Judging from the discoloration of spark plugs, if they are found improper , it can be corrected by the following two methods; changing carburetor settings and changing the heat range of spark plug.
TUN 7-13 SETTING EC720000 CHASSIS EC71P002 Selection of the secondary reduction ratio (Sprocket) Secondary Number of driven sprocket teeth reduction = —————————————— ratio .
TUN 7-14 SETTING EC72N000 Drive and driven sprockets setting parts EC721002 T ire pressure T ire pressure should be adjust to suit the road surface condition of the circuit. 9 Under a rainy , muddy , sandy , or slippery condi- tion, the tire pressure should be lower for a larg- er area of contact with the road surface.
TUN 7-15 SETTING EC722011 Front fork setting The front fork setting should be made depending on the rider ’s feeling of an actual run and the cir- cuit conditions. The front fork setting includes the following three factors: 1. Setting of air spring characteristics 9 Change the fork oil level.
TUN 7-16 SETTING EC727021 Spring preload adjustment The spring preload is adjusted by installing the adjustment washer 1 between the fork spring 2 and damper rod 3 . c C Do not install three or more adjustment washers for each front fork. w Always adjust each front fork to the same setting.
TUN 7-17 SETTING 2. Use of stiff spring Generally a stiff spring gives a stif f riding feeling. Rebound damping tends to become weaker , resulting in lack of a sense of con- tact with the road surface or in a vibrating handlebar . T o set a stiff spring: 9 Change the rebound damping.
TUN 7-18 SETTING EC72P010 Front fork setting parts 9 Adjustment washer 1 9 Front fork spring 2 [Equal pitch spring ] [Unequal pitch spring ] NOTE: 9 The unequal pitch spring is softer in initial char- acteristic than the equal pitch spring and is diffi- cult to bottom out under full compression.
TUN 7-19 SETTING EC72B000 Rear suspension setting The rear suspension setting should be made depending on the rider ’s feeling of an actual run and the circuit conditions. The rear suspension setting includes the follow- ing two factors: 1. Setting of spring preload 9 Change the set length of the spring.
TUN 7-20 SETTING NOTE: 9 If the machine is new and after it is broken in, the same set length of the spring may change because of the initial fatigue, etc.
TUN 7-21 SETTING c C When using a rear cushion other than cur- rently installed, use the one whose overall length a a does not exceed the standard as it may result in faulty performance.
TUN 7-22 SETTING EC72Q011 Rear shock absorber setting parts 9 Rear shock spring 1 [Equal pitch spring ] [Unequal pitch spring ] NOTE: 9 The unequal pitch spring is softer in initial char- acteristic than the equal pitch spring and is diffi- cult to bottom out under full compression.
TUN 7-23 SETTING EC72H010 Suspension setting 9 Front fork NOTE: 9 If any of the following symptoms is experienced with the standard position as the base, make reset- ting by reference to the adjustment procedure given in the same chart. 9 Before any change, set the rear shock absorber sunken length to the standard figure 90~100 mm (3.
TUN 7-24 SETTING 9 Rear shock absorber NOTE: 9 If any of the following symptoms is experienced with the standard position as the base, make reset- ting by reference to the adjustment procedure given in the same chart. 9 Adjust the rebound damping in 2-click increments or decrements.
PRINTED IN JAPAN 2000.6 | 2.9 ´ 1 iE j YZ125N1 PRINTED ON RECYCLED PAPER Y AMAHA MOT OR CO. , L TD. 2500 SHINGAI IW A T A SHIZUOKA JAP AN PROTECT YOUR INVESTMENT Use Genuine YAMAHA Parts And Accessories 5MV-10 00.
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