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 WR450FX 2008 Owner's Manual

Pages 310

Year 2008

Language(s)

of 310

Yamaha WR450FX 2008 Specification

The Yamaha WR450FX 2008 is a high-performance off-road motorcycle engineered for competition and demanding trail riding. It is powered by a 449cc, liquid-cooled, DOHC, four-stroke engine that delivers robust power and torque. The engine features a five-valve titanium cylinder head and a Keihin FCR39 flat-slide carburetor with throttle position sensor, ensuring precise fuel delivery and optimal performance. The transmission is a wide-ratio five-speed gearbox designed to handle various terrains with ease.

The chassis of the WR450FX is constructed from a lightweight aluminum frame, contributing to its agile handling and durability. The bike is equipped with fully adjustable KYB suspension, including 48mm upside-down front forks and a rear shock, providing excellent stability and comfort over rough terrain. The braking system comprises wave-style disc brakes with a 250mm front and 245mm rear rotor, offering reliable stopping power.

Ergonomically, the WR450FX is designed for rider comfort and control, featuring a slim profile, a lightweight feel, and a comfortable seat height of 37.8 inches. It also includes an electric starter for easy ignition, complemented by a compact, lightweight battery. The fuel tank has a capacity of 2.1 gallons, allowing for extended rides without frequent refueling.

Additional features include a digital enduro computer with speedometer, odometer, clock, and trip meter, providing essential information at a glance. The bike’s aggressive styling is highlighted by its distinctive blue and white color scheme, along with durable, high-quality plastics designed to withstand the rigors of off-road riding.

Overall, the Yamaha WR450FX 2008 combines advanced engineering, robust performance, and rider-friendly features, making it a formidable choice for serious off-road enthusiasts and competitors.

Yamaha WR450FX 2008 F.A.Q.

What type of engine oil should I use for the Yamaha WR450FX 2008?

For the Yamaha WR450FX 2008, use a high-quality 4-stroke motorcycle oil with a viscosity rating of 10W-40. Ensure the oil meets JASO MA standards for optimal performance.

How often should the air filter be cleaned?

The air filter should be cleaned after every 10 hours of riding in dusty conditions, or as recommended in the owner’s manual for less severe conditions.

What is the recommended tire pressure for the Yamaha WR450FX 2008?

The recommended tire pressure is 15 psi for both front and rear tires for general off-road use. Adjust according to terrain and riding style.

How do I adjust the suspension on my Yamaha WR450FX 2008?

To adjust the suspension, refer to the adjustment knobs on the forks and shock absorber. Consult the owner’s manual for specific settings based on rider weight and terrain.

What spark plug is suitable for the WR450FX 2008 model?

The suitable spark plug for the Yamaha WR450FX 2008 is the NGK CR8E or equivalent. Ensure the gap is set to 0.7-0.8 mm.

Why is my WR450FX 2008 overheating?

Overheating can be caused by several factors: low coolant levels, a clogged radiator, or a malfunctioning thermostat. Check these components and ensure they are functioning properly.

How do I change the brake pads on my WR450FX 2008?

To change the brake pads, remove the caliper bolts, slide out the caliper, and replace the old pads with new ones. Ensure the pistons are pushed back before reinstallation.

What is the correct chain tension for the Yamaha WR450FX 2008?

The chain should have about 1.6 inches (40 mm) of slack at its tightest point. Check and adjust tension regularly to avoid excessive wear.

How can I improve the fuel efficiency of my WR450FX 2008?

To improve fuel efficiency, ensure regular maintenance such as cleaning the air filter, keeping tires properly inflated, and riding smoothly without aggressive throttle inputs.

What should I do if my WR450FX 2008 won't start?

If the bike won't start, check the battery charge, fuel level, and spark plug condition. Verify the kill switch is off and the bike is in neutral. Troubleshoot further if these are not the issue.