Yamaha YFZ450X, YFZ450SPX YFZ 450 2008 Owner's Manual

Yamaha YFZ450X, YFZ450SPX YFZ 450 2008 manual cover

Pages 170

Year 2008

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Yamaha YFZ450X, YFZ450SPX YFZ 450 2008 Specification

The Yamaha YFZ450X, YFZ450SPX, and YFZ 450 2008 are high-performance all-terrain vehicles (ATVs) designed for competitive racing and aggressive off-road riding. These models are powered by a 449cc liquid-cooled, single-cylinder, four-stroke engine that delivers robust power and torque. The engine is coupled with a five-speed manual transmission with a multi-plate wet clutch, providing precise control and rapid acceleration. The chassis is constructed from lightweight aluminum, ensuring strength and durability without compromising agility. The suspension system features fully adjustable front and rear shocks, allowing riders to fine-tune their ride for various terrains and riding styles.

The YFZ450X and YFZ450SPX include additional enhancements such as special edition graphics and performance upgrades. Both models are equipped with dual hydraulic disc brakes in the front and a single hydraulic disc brake in the rear, offering reliable stopping power. The ergonomic design includes a comfortable seat, wide footpegs, and an easy-to-grip handlebar, ensuring rider comfort and control during long rides. Advanced fuel injection technology ensures optimal fuel delivery and efficient performance across a wide range of conditions.

The YFZ450 models are renowned for their exceptional handling, thanks to a precision-engineered frame geometry and high-performance tires that provide excellent traction and stability. These ATVs are also equipped with a high-capacity radiator and fan system to maintain optimal engine temperatures during intense use. With a dry weight of approximately 350 pounds, the Yamaha YFZ450 series offers a competitive edge in terms of power-to-weight ratio. The 2008 models continue to be a popular choice among enthusiasts and professional racers due to their blend of power, agility, and advanced engineering.

Yamaha YFZ450X, YFZ450SPX YFZ 450 2008 F.A.Q.

How do I adjust the chain tension on my Yamaha YFZ450X?

To adjust the chain tension, first, place the ATV on a level surface and turn off the engine. Loosen the rear axle nut using a wrench. Adjust the chain tensioner bolts on both sides of the swingarm until the chain has about 1-1.5 inches of slack. Tighten the axle nut and recheck the tension.

What is the recommended oil type and capacity for the Yamaha YFZ 450 2008?

The recommended oil type for the Yamaha YFZ450 2008 is SAE 10W-40. The oil capacity with a filter change is approximately 1.95 liters (2.06 US quarts). Always check the owner’s manual for the most accurate information.

How can I troubleshoot starting issues with my YFZ450SPX?

If your YFZ450SPX won't start, first check the battery charge and connections. Ensure the kill switch is in the 'run' position. Verify the fuel level and inspect the fuel line for clogs. Check the spark plug for fouling and replace if necessary.

How often should I clean the air filter on my YFZ450X?

It is recommended to clean the air filter after every 10-15 hours of riding, especially in dusty conditions. More frequent cleaning may be necessary if you ride in particularly dirty environments.

What are the steps for adjusting the valve clearance on a Yamaha YFZ450SPX?

To adjust the valve clearance, remove the seat and fuel tank, then the valve cover. Rotate the engine to top dead center on the compression stroke. Use a feeler gauge to check the clearance between the cam lobe and valve. Adjust as necessary by selecting the appropriate shim size. Reassemble in reverse order.

Why does my YFZ450X overheat and how can I prevent it?

Overheating can result from low coolant levels, a clogged radiator, or a malfunctioning thermostat. Regularly check and maintain coolant levels, keep the radiator clean, and ensure the fan is operational. Replace the thermostat if necessary.

How do I replace the brake pads on my Yamaha YFZ 450 2008?

To replace brake pads, lift the ATV and remove the wheel. Unbolt the brake caliper and slide it off the rotor. Remove the old pads and install new ones, ensuring they are properly seated. Reattach the caliper and wheel, then test the brakes for proper function.

What could cause a loss of power in my YFZ450SPX?

Loss of power can be due to a clogged air filter, faulty spark plug, or fuel delivery issues. Ensure the air filter is clean, check and replace the spark plug if needed, and inspect the fuel lines for blockages.

How do I properly store my YFZ450X for the winter?

For winter storage, clean the ATV thoroughly and change the oil. Add fuel stabilizer to a full tank of gas, and run the engine for a few minutes. Disconnect the battery and store it in a cool, dry place. Elevate the tires to prevent flat spots.

What is the correct tire pressure for my Yamaha YFZ 450 2008?

The recommended tire pressure for the Yamaha YFZ 450 2008 is 4 psi (27.6 kPa) for both front and rear tires. Always use a reliable gauge to check pressure when the tires are cold for an accurate reading.