Contents

- GENERAL INFORMATION
  - DESCRIPTION
  - MACHINE IDENTIFICATION
  - INCLUDED PARTS
  - IMPORTANT INFORMATION
  - CHECKING OF CONNECTION
  - SPECIAL TOOLS
  - CONTROL FUNCTIONS
  - MULTI-FUNCTION DISPLAY
  - STARTING AND BREAK-IN
  - TORQUE-CHECK POINTS
  - CLEANING AND STORAGE
- SPECIFICATIONS
  - GENERAL SPECIFICATIONS
  - MAINTENANCE SPECIFICATIONS
  - TIGHTENING TORQUES
  - LUBRICATION DIAGRAMS
  - CABLE ROUTING DIAGRAM
- REGULAR INSPECTION AND ADJUSTMENTS
  - PERIODIC MAINTENANCE CHART FOR THE EMISSION CONTROL SYSTEM
  - GENERAL MAINTENANCE AND LUBRICATION CHART
  - MAINTENANCE INTERVALS FOR COMPETITION USE
  - PRE-OPERATION INSPECTION AND MAINTENANCE
  - ENGINE
  - CHASSIS
  - ELECTRICAL
- TUNING
  - CHASSIS
- ENGINE
  - RADIATOR
  - CARBURETOR
  - AIR INDUCTION SYSTEM
  - CAMSHAFTS
  - CYLINDER HEAD
  - VALVES AND VALVE SPRINGS
  - CYLINDER AND PISTON
  - CLUTCH
  - OIL FILTER ELEMENT AND WATER PUMP
  - BALANCER
  - OIL PUMP
  - KICK SHAFT AND SHIFT SHAFT
  - AC MAGNETO AND STARTER CLUTCH
  - ENGINE REMOVAL
  - CRANKCASE AND CRANKSHAFT
  - TRANSMISSION, SHIFT CAM AND SHIFT FORK
- CHASSIS
  - FRONT WHEEL AND REAR WHEEL
  - FRONT BRAKE AND REAR BRAKE
  - FRONT FORK
  - HANDLEBAR
  - STEERING
  - SWINGARM
  - REAR SHOCK ABSORBER
- ELECTRICAL
  - ELECTRICAL COMPONENTS AND WIRING DIAGRAM
  - IGNITION SYSTEM
  - ELECTRIC STARTING SYSTEM
  - CHARGING SYSTEM
  - THROTTLE POSITION SENSOR SYSTEM
  - LIGHTING SYSTEM
  - SIGNALING SYSTEM

Yamaha WR250FX 2008 Owner's Manual

Pages 314

Year 2008

Language(s)

of 314

Yamaha WR250FX 2008 Specification

The Yamaha WR250FX 2008 is a high-performance off-road motorcycle designed for enduro racing and trail riding. It features a liquid-cooled, four-stroke, DOHC, 250cc engine that delivers robust power and torque across a wide RPM range, making it suitable for various terrains and riding conditions. The engine is equipped with a 5-valve cylinder head and titanium intake valves, ensuring efficient airflow and optimal combustion.

The WR250FX utilizes a constant-mesh, 5-speed transmission, providing smooth and precise gear shifts essential for competitive off-road riding. Its advanced fuel delivery system, featuring a Keihin FCR-MX37 carburetor, ensures consistent throttle response and fuel efficiency. The bike's suspension system includes a fully adjustable KYB fork with 270mm of travel in the front and a fully adjustable KYB shock with 300mm of travel in the rear, offering exceptional handling and stability over rough terrain.

Built on a lightweight aluminum frame, the WR250FX balances rigidity and flexibility, enhancing rider control and comfort. The bike's braking system comprises a 250mm hydraulic disc brake at the front and a 245mm hydraulic disc brake at the rear, providing reliable stopping power in various conditions. The motorcycle's ergonomics are tailored for off-road performance, featuring a narrow seat and slim bodywork that allow easy maneuverability and rider movement.

The WR250FX comes with an 18-inch rear wheel and a 21-inch front wheel, both fitted with durable off-road tires designed for superior traction. Additional features include an electric start for convenience, a compact digital instrument panel, and a robust fuel tank with a capacity of 8 liters, ensuring extended riding sessions. Overall, the Yamaha WR250FX 2008 is engineered to deliver exceptional performance, reliability, and versatility for serious off-road enthusiasts.

Yamaha WR250FX 2008 F.A.Q.

What is the recommended oil type and capacity for the Yamaha WR250FX 2008?

The recommended oil type for the Yamaha WR250FX 2008 is 10W-40, and the oil capacity is approximately 1.2 liters when changing the oil and filter.

How often should I clean the air filter on my Yamaha WR250FX 2008?

It is recommended to clean the air filter after every ride in dusty conditions or every 10 hours of riding under normal conditions.

What is the proper chain tension for the Yamaha WR250FX 2008?

The proper chain tension for the Yamaha WR250FX 2008 is approximately 30-40mm of slack in the middle of the chain when measured from the swingarm.

How do I troubleshoot a non-starting Yamaha WR250FX 2008?

First, check the battery charge and connections. Ensure the fuel is reaching the engine and the spark plug is in good condition. Inspect the kill switch and kickstand switch to ensure they are functioning properly.

What is the recommended tire pressure for the Yamaha WR250FX 2008?

The recommended tire pressure is 15 psi for both front and rear tires for standard off-road conditions. Adjust based on terrain and riding style.

How can I improve the suspension performance on my Yamaha WR250FX 2008?

Improving suspension performance can be achieved by adjusting the preload, compression, and rebound settings to match your riding style and weight. Consider consulting a suspension specialist for personalized tuning.

What should I check during routine maintenance on the Yamaha WR250FX 2008?

Routinely check the oil level, coolant level, chain tension, brake pads, tire pressure, and air filter. Inspect for loose bolts and ensure the throttle and clutch cables are properly adjusted.

How do I adjust the valve clearance on a Yamaha WR250FX 2008?

Adjusting the valve clearance involves removing the seat, fuel tank, and valve cover. Use a feeler gauge to measure the gap and adjust it to within the specified range with the engine cold. Refer to the service manual for detailed steps.

What could cause overheating in my Yamaha WR250FX 2008?

Overheating can be caused by low coolant levels, a faulty thermostat, clogged radiator fins, or a malfunctioning water pump. Ensure proper airflow to the radiator and check the cooling system components.

How can I enhance the performance of my Yamaha WR250FX 2008 for racing?

Enhancing performance can involve upgrading the exhaust system, re-jetting the carburetor, installing a high-performance air filter, and tuning the suspension. Ensure all modifications comply with racing regulations.