2008 Yamaha YZ250FX Owner's Service Manual
Yamaha Models Covered & Key Technical Specifications
Models: 2008 Yamaha YZ250FX (USA, CDN, AUS, NZ), 2008 Yamaha YZ250F (Europe, ZA)
Sub-models / Variants: USA, Canada, Australia, New Zealand, Europe, South Africa
Model Years: 2008
Serial Numbers: 5XCL (USA, CDN), 5XCM (Europe), 5XCP (AUS, NZ, ZA)
Technical Data:
- Engine type: Liquid cooled 4-stroke, DOHC
- Engine displacement: 249 cm3
- Bore x stroke: 77.0 x 53.6 mm
- Compression ratio: 13.5:1
- Carburetor type: FCR-MX37 (Keihin)
- Dry weight: 92.7 kg (204 lb)
- Fuel tank capacity: 7.0 L
- Transmission: 5-speed constant mesh
- Ignition system: CDI magneto
- Coolant capacity: 0.99 L
Yamaha Manual Features & Content Preview
- Covers the 2008 Yamaha YZ250FX and YZ250F motocross machines, detailing technical specifications for the 5XCL, 5XCM, and 5XCP model codes
- Serves as the official Yamaha publication P/N 5XC-L0, providing the complete OEM owner's reference
- Includes 47 exploded-view diagrams, 16 maintenance specification tables, and 2 cable routing layouts to support complex repair jobs in the shop
- Delivers comprehensive mechanical data specifically for the liquid-cooled 4-stroke DOHC engine architecture
Documented Systems and Maintenance Coverage
The 186-page reference manual provides detailed technical guidance for all major assemblies. Chapters start with General Information and Specifications. This naturally transitions into extensive documentation covering Regular Inspection and Adjustments. Engine sections focus heavily on the fuel system, specifically the FCR-MX37 carburetor, alongside the cylinder head, camshafts, piston, clutch, and water pump. Moving to the chassis, the text outlines suspension tuning for the front fork and rear monocross, steering head maintenance, and hydraulic brake servicing. Final chapters detail the ignition system, sensor diagnostics, and chassis tuning parameters. Proper workspace safety protocols and equipment handling procedures must always be observed when working on these high-performance components to prevent injury or mechanical failure.
Technical Reference and Specification Highlights
To streamline the diagnostic and repair workflow, the specification tables include critical baseline values. For example, standard tire pressure is set at 100 kPa, while the engine oil capacity requires 1.15 L with a filter replacement. Mechanics will find exact tolerances, such as a cylinder head warpage limit of 0.05 mm and a spark plug gap of 0.7–0.8 mm. Accurate assembly is ensured with torque values listed for every fastener, notably 145 Nm for the steering stem nut. Additionally, the document details precise carburetor jetting configurations and electrical sensor thresholds.
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