Yamaha WR Series (WR250F) - Owner's Service Manual: Operation, Inspection, Maintenance & Tuning (2002)

Yamaha WR250F (2002) - Complete Owner's Service & Tuning Guide

Unleash the full potential of your 2002 Yamaha WR series with the definitive technical resource. This official Owner's Service Manual is the same guide used by factory-trained technicians to maintain and tune Yamaha’s high-performance racing machines. Designed specifically for the competitive environment of off-road riding and closed-course racing, this manual offers unparalleled depth into the mechanics of the 249cc DOHC single-cylinder engine.

Comprehensive Model Coverage

This guide provides precise data for all regional variants of the 2002 WR250F listed in the documentation:

• WR250F(P) (USA Model Code: 5PH5)
• WR250F (Europe Model Code: 5PH6)
• WR250F(P) (Canada, Australia, New Zealand, South Africa Model Code: 5PH8)

What Is Inside?

Every procedure is presented in a sequential, step-by-step format with clear exploded diagrams for effortless disassembly and repair.

• Engine Mastery: Complete teardown and assembly for the liquid-cooled, 4-stroke engine, including detailed specs on the FCR-MX37 Keihin carburetor.
• Maintenance Guidelines: Step-by-step procedures for periodic maintenance tasks, including oil changes and valve clearance adjustments.
• Chassis & Suspension: Expert tuning for the telescopic front fork and the link-type Monocross rear suspension to conquer any terrain.
• Electrical Systems: In-depth coverage of the CDI Magneto, lighting systems, and full wiring diagrams for troubleshooting.
• Advanced Tuning: Specialized sections on engine and chassis adjustments to refine your machine for race-day performance.

Essential Identification Data

Never guess when ordering parts. This manual identifies exactly where your machine's unique serial numbers are located:

• Vehicle Identification Number (VIN): Stamped on the right side of the steering head pipe.
• Engine Serial Number: Stamped on the elevated portion of the right-side crankcase.
• Model Label: Located on the frame under the rider's seat for positive part identification.

Professional-Grade Maintenance

The manual includes a rigorous maintenance schedule tailored for racing, from tasks required after every race to major inspections at 1,000 km intervals. You will find critical torque specifications—such as the 125 Nm (90 ft-lb) for the rear axle nut—ensuring your machine remains safe and reliable under the stresses of competition.

This is the ultimate tool for the serious rider and mechanic, providing the craftsmanship and reliability that have made Yamaha a leader in the racing world.