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Yamaha YZ250FX 2021 User Manual

Yamaha YZ250FX 2021
378 pages
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Read this manual carefully before operating this vehicle.
2021
OWNER’S SERVICE MANUAL
YZ250FX
YZ250FXM
LIT-11626-34-54 BAJ-2819U-11

Table of Contents

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Yamaha YZ250FX 2021 Specifications

General IconGeneral
Bore x Stroke77.0mm x 53.6mm
Compression Ratio13.8:1
IgnitionTCI: Transistor Controlled Ignition
Final DriveChain
Brakes FrontHydraulic disc, 270mm
Brakes RearHydraulic disc, 245mm
Seat Height37.6 in
Ground Clearance12.8 in
Fuel Capacity2.2 gal
Wet Weight247 lb
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryFuel injection
Suspension FrontKYB® Speed-Sensitive System, inverted fork; fully adjustable
Suspension RearKYB® single shock; fully adjustable
Tire Front80/100-21
Tire Rear110/100-18

Summary

General Information

Safety Information

Essential safety precautions and advice for operating the motorcycle.

Special Tools

List of specialized tools required for maintenance and assembly procedures.

Starting and Break-in

Procedures for starting the engine and the initial break-in period.

Specifications

General Specifications

Overall dimensions, weight, and riding capacity of the vehicle.

Engine Specifications

Detailed specifications for engine components, including bore, stroke, and oil capacity.

Chassis Specifications

Technical data for the vehicle's frame, wheels, brakes, and suspension.

Periodic Checks and Adjustments

Maintenance Intervals

Schedule for routine maintenance tasks based on operating hours or races.

Pre-Operation Inspection and Maintenance

Checks to perform before riding for break-in, practice, or racing.

Engine

Procedures for checking and adjusting engine components like valve clearance.

Chassis

Front Wheel

Procedures for removing, disassembling, and checking the front wheel.

Rear Wheel

Steps for removing, disassembling, and checking the rear wheel and sprocket.

Front Brake

Detailed instructions for servicing the front brake caliper and master cylinder.

Engine

Engine Removal

Step-by-step process for removing the engine assembly from the chassis.

Camshaft

Procedures for removing, checking, and installing the camshaft and related parts.

Cylinder Head

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

Electrical System

Ignition System

Information on the ignition system's circuit diagram and troubleshooting.

Electric Starting System

Details on the starting system's circuit diagram and troubleshooting.

Charging System

Information about the charging system's circuit diagram and troubleshooting.

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