Yamaha WR250F(T) WR Series Off-Road Motorcycle Owner's Service Manual 2005

Yamaha WR250F(T) Owner's Service Manual (2005)

The Yamaha WR250F(T) Owner's Service Manual is the definitive professional resource for owners and mechanics of this championship-bred off-road machine. This manual, first edition published in July 2004, is specifically designed to cover the 2005 model year (Model Code 5UM8 for the US market). It represents the culmination of Yamaha's vast racing experience, providing the highest grade of technical detail to ensure the reliability and performance that defines the WR series.

Extensive Model & Identification Coverage

This manual is meticulously detailed to assist in positive vehicle identification and precise parts ordering. It covers several regional variations of the 250cc high-performance series:

• WR250F(T) (2004-2005)
• Yamaha WR250F (2004-2005)

Important Serial Numbers for your Records:

• Vehicle Identification Number (VIN): Stamped on the right side of the steering head pipe.
• Engine Serial Number: Stamped on the elevated part of the right-side engine boss.
• Model Label: Affixed to the frame under the rider's seat.

Deep-Dive Technical Content

This manual is structured into seven comprehensive chapters, providing a seamless transition from basic maintenance to advanced engine and chassis tuning:

1. General Information: Essential data on machine identification, special tools, and fundamental control functions.
2. Specifications: Complete technical breakdown, including the 249cc liquid-cooled 4-stroke DOHC engine with a 12.5:1 compression ratio.
3. Regular Inspection & Adjustments: Detailed schedules and step-by-step guides for race-ready maintenance, including valve clearance and drive chain slack.
4. Engine Overhaul: In-depth procedures for the Keihin FCR-MX37 carburetor, dry-sump lubrication system, and the titanium 5-valve cylinder head.
5. Chassis & Suspension: Expert instructions for the 48mm telescopic forks and link-type Monocross rear suspension, including specialized oil level settings.
6. Electrical System: Full coverage of the AC Magneto, map-controlled CDI unit, and the electric start system with complete wiring diagrams.
7. Tuning: Professional tips to optimize engine performance and chassis handling for different track conditions and rider styles.

Professional Shop Features

• Exploded Diagrams: Every major section begins with an easy-to-read exploded view, identifying parts, lubrication points, and torque requirements.
• Torque-Check Points: A dedicated section lists every critical fastener to ensure your bike stays assembled under the rigors of competition.
• Special Tool Guides: Detailed lists of Yamaha-specific tools to prevent damage during complex repairs.
• F.I.M. Compliance: Includes minimum weight specifications (98 kg for the 250cc class) for riders preparing for official competitions.

This manual is more than just a guide; it is an essential piece of equipment for your garage. It provides the confidence and data needed to perform everything from a simple oil change to a full engine rebuild, ensuring your Yamaha WR250F(T) remains a leader on the trail.

Technical Quick-Specs

• Engine Type: Liquid-cooled 4-stroke, forward-inclined single cylinder.
• Transmission: 5-speed constant mesh with left-foot operation.
• Fuel: Premium unleaded gasoline (95 octane or higher).
• Spark Plug: NGK CR8E (0.7–0.8 mm gap).
• Tire Pressure: 100 kPa (15 psi) front and rear.