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Yamaha WR450F 2021 User Manual

Yamaha WR450F 2021
402 pages
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Read this manual carefully before operating this vehicle.
2021
OWNER’S SERVICE MANUAL
WR450F
WR450FM
LIT-11626-34-50 BDB-2819U-10

Table of Contents

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Yamaha WR450F 2021 Specifications

General IconGeneral
Displacement449cc
Bore x Stroke97.0mm x 60.8mm
Compression Ratio13.0:1
IgnitionTCI: Transistor Controlled Ignition
Final DriveChain
Front BrakesHydraulic disc, 270mm
Rear BrakesHydraulic disc, 245mm
L x W x H85.6 in x 32.5 in x 50.0 in
Wheelbase58.3 in
Wet Weight262 lb
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel SystemFuel Injection
Transmission5-speed
Front SuspensionKYB® Speed-Sensitive System, inverted fork, fully adjustable; 12.2-in travel
Rear SuspensionKYB® single shock
Front Tire80/100-21
Rear Tire120/90-18

Summary

General Information

Safety Information

Provides essential safety guidelines and precautions for operating the vehicle.

Specifications

Engine Specifications

Lists detailed specifications for the engine, including combustion cycle, bore, stroke, and oil quantities.

Tightening Torques

Specifies general and engine-specific tightening torques for fasteners to ensure proper assembly.

Periodic Checks and Adjustments

Periodic Maintenance

Details periodic maintenance schedules and jobs for emission control and general maintenance.

Pre-Operation Inspection and Maintenance

Outlines essential pre-operation checks and maintenance procedures to ensure safe operation.

Engine

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

Chassis

Covers checks and adjustments for chassis components including brakes, wheels, steering, and suspension.

Chassis

Front Brake

Covers removal, disassembly, checking, and assembly of the front brake caliper and master cylinder.

Rear Brake

Provides procedures for removing, disassembling, checking, and assembling the rear brake caliper and master cylinder.

Front Fork

Outlines procedures for removing, disassembling, checking, and assembling the front fork legs.

Engine

Cylinder and Piston

Outlines procedures for removing, checking, and installing the cylinder, piston, and piston rings.

Clutch

Covers the removal, checking, and installation of clutch components, including plates, springs, and housing.

Crankshaft and Balancer Shaft

Details the removal, checking, and installation procedures for the crankshaft and balancer shaft assemblies.

Transmission

Covers removal, checking, and installation of the transmission, shift forks, and drum assembly.

Cooling System

Fuel System

Electrical System

Ignition System

Details the circuit diagram and troubleshooting steps for the ignition system.

Electric Starting System

Provides the circuit diagram and troubleshooting guide for the electric starting system.

Charging System

Covers the circuit diagram and troubleshooting procedures for the charging system.

Fuel Injection System

Covers the circuit diagram, ECU self-diagnostics, and troubleshooting for the fuel injection system.

Troubleshooting

Troubleshooting of Engine (Fault Code Not Detected)

Guides through diagnosing engine issues like failure to crank or start, with possible causes and actions.

Troubleshooting of Brake

Details troubleshooting for poor brake performance, including pad wear, fluid issues, and caliper problems.

Troubleshooting of Suspension

Covers symptoms related to front and rear suspension, such as stiffness, softness, leaks, and handling.

Troubleshooting of Steering/Handling

Addresses issues like handlebar wobble, heavy steering, and front wheel vibration with corresponding solutions.

Troubleshooting of Charging System

Guides through diagnosing issues with the charging system, primarily focusing on battery charging problems.

Self-Diagnostic Function and Diagnostic Code Table

Provides tables for self-diagnostic functions and diagnostic codes for the fuel injection system.

Tuning

Suspension Setting (Front Fork)

Provides a chart for adjusting front fork settings based on symptoms like stiffness, unsmooth movement, and bottoming out.

Suspension Setting (Rear Shock Absorber)

Offers a chart for adjusting rear shock absorber settings based on symptoms like stiffness, sponginess, and handling.

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