Yamaha XT250, XT250X, XT250XC - Precision Service Handbook & Troubleshooting (2008)

Yamaha XT250 Dual Sport Service Manual (2008)

The 2008 Yamaha XT250 series is the gold standard for versatile dual-sport performance. Whether you are navigating city streets on the XT250X or tackling rugged trails on the XT250, keeping your machine in peak condition is vital for safety and longevity. This professional-grade service manual provides the exact factory procedures used by certified Yamaha technicians to maintain, repair, and overhaul these legendary 249cc powerhouses.

This manual is specifically engineered for the 2008 model year, covering the standard XT250 alongside the XT250X and XT250XC variants. It serves as an indispensable resource for DIY enthusiasts looking to save on shop labor costs and professional mechanics requiring precise technical data.

Model Coverage & Identification

This manual provides comprehensive support for the following 2008 Yamaha models:

• XT250X (2008)
• XT250XC (2008)
• XT250 (2008)

To ensure you are using the correct data for your specific bike, the manual includes detailed identification guides. You can locate your Vehicle Identification Number (VIN) stamped on the right side of the steering head pipe. For parts ordering, refer to the Model Label affixed to the frame. The manual specifically references model codes 3C58 (U49/General US) and 3C59 (California models).

Technical Highlights & Engine Specs

Deep dive into the heart of your Yamaha with complete specifications for the air-cooled, 4-stroke, SOHC forward-inclined single-cylinder engine.

• Displacement: 249.0 cm³
• Bore x Stroke: 74.0 x 58.0 mm
• Compression Ratio: 9.50:1
• Carburetion: TEIKEI MV33 x 1 (ID Marks: 3C58 00 for U49; 3C59 00 for CAL)
• Ignition: CDI (Digital advancer)
• Maintenance Criticals: Standard spark plug NGK/DR7EA with a 0.6–0.7 mm gap.

Comprehensive Maintenance & Repair

This manual leaves no bolt unturned. It is organized into logical chapters for rapid navigation during a repair:

• Periodic Checks: Detailed schedules for valve clearance adjustments (Cold Intake: 0.05–0.10 mm; Exhaust: 0.10–0.15 mm), engine idling speed (1300–1500 r/min), and spark plug inspection.
• Chassis Service: Step-by-step guides for the semi-double cradle frame, including front telescopic forks (225 mm travel) and rear Monocross suspension.
• Braking System: Complete overhaul procedures for the 245 mm front single disc and 203 mm rear disc brakes, including hydraulic bleeding and pad replacement.
• Electrical System: Full-color style wiring diagrams, starter motor testing (0.40 kW output), and battery charging protocols for the YTZ7S lead-acid battery.

Why This Manual Provides Real Value

Beyond basic oil changes, this manual empowers you with expert-level knowledge:

• Exploded View Diagrams: See exactly how components fit together before you pick up a wrench.
• Precision Torque Specs: Prevent stripped threads and ensuring safety with a complete tightening torque chart for every engine and chassis fastener.
• Troubleshooting Guide: A dedicated section to help you diagnose starting failures, poor engine performance, or unstable handling quickly and accurately.
• Special Tool Lists: Know exactly which Yamaha-specific tools (like the Tappet Adjusting Tool 90890-01311 or Pocket Tester 90890-03132) are required for the job.

Whether you are performing a simple chain adjustment or a full top-end rebuild, the Yamaha XT250 Service Manual is the most important tool in your garage. Keep your dual-sport adventure-ready and ensure it performs to factory specifications for years to come.