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Yamaha YZ250FX 2020 User Manual

Yamaha YZ250FX 2020
376 pages
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BAJ-28199-10LIT-11626-33-34
Read this manual carefully before operating this vehicle.
YZ250FXL1
OWNER’S SERVICE MANUAL
YZ250FX
2020
PRINTED IN JAPAN
2019.07-0.8×1 !
(E)
2020
YZ250FXL1
BAJ-28199-10_cover_US_10mm_FCC.indd 1-3 2019/07/10 9:35:16

Table of Contents

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Yamaha YZ250FX 2020 Specifications

General IconGeneral
Engine TypeLiquid-cooled, 4-stroke, DOHC, 4-valve
Displacement250cc
Bore x Stroke77.0mm x 53.6mm
Compression Ratio13.5:1
Fuel SystemFuel Injection
IgnitionTCI
Final DriveChain
Front BrakesHydraulic disc, 270mm
Rear BrakesHydraulic disc, 245mm
Length85.6 in
Width32.5 in
Height50.4 in
Seat Height37.6 in
Ground Clearance12.8 in
Front SuspensionKYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Front Tire80/100-21
Rear Tire110/100-18

Summary

General Information

Safety Information

Details essential safety precautions, riding techniques, and protective apparel.

Torque-Check Points

Specifications for tightening torques of various fasteners and components.

Specifications

Engine Specifications

Technical specifications for the engine, including combustion, cooling, and oil systems.

Tightening Torques

Lists general and specific tightening torque values for fasteners and components.

Periodic Checks and Adjustments

Maintenance Intervals

Recommended schedule for periodic inspections and maintenance tasks.

Pre-Operation Inspection and Maintenance

Essential checks and maintenance before operating the vehicle for safety and performance.

Engine

Detailed procedures for checking and adjusting engine components like valve clearance and oil.

Chassis

Procedures for inspecting and adjusting chassis components such as brakes, suspension, and wheels.

Electrical System

Procedures for checking and maintaining the vehicle's electrical system.

Chassis

Front Brake

Detailed procedures for maintenance and repair of the front brake system.

Rear Brake

Detailed procedures for maintenance and repair of the rear brake system.

Engine

Engine Removal

Step-by-step instructions for safely removing the engine from the motorcycle frame.

Cylinder Head

Procedures for removing, checking, and installing the cylinder head assembly.

Cylinder and Piston

Procedures for removing, checking, and installing the cylinder, piston, rings, and pin.

Clutch

Procedures for removing, checking, and installing the clutch assembly components.

Oil Pump

Procedures for removing, checking, and installing the oil pump and balancer components.

Crankcase

Procedures for separating, disassembling, checking, and assembling the crankcase.

Crankshaft and Balancer Shaft

Procedures for removing, checking, and installing the crankshaft and balancer shaft.

Transmission

Procedures for removing, checking, and installing the transmission gears, shafts, and forks.

Cooling System

Fuel System

Electrical System

Ignition System

Circuit diagram and troubleshooting for the ignition system.

Electric Starting System

Circuit diagram and troubleshooting for the electric starting system.

Charging System

Circuit diagram and troubleshooting for the charging system.

Fuel Injection System

Detailed troubleshooting and diagnostic information for the fuel injection system.

Troubleshooting

Troubleshooting of Engine (Fault Code Not Detected)

Diagnosing engine issues when no fault codes are present.

Wiring Diagram

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