Yamaha YFZ450S YFZ 450 2004 Owner's Manual

Yamaha YFZ450S YFZ 450 2004 manual cover

Pages 190

Year 2004

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Yamaha YFZ450S YFZ 450 2004 Specification

The Yamaha YFZ450S YFZ 450, released in 2004, is a high-performance all-terrain vehicle (ATV) engineered for off-road enthusiasts and competitive racers. This model is powered by a 449cc liquid-cooled, DOHC, four-stroke engine that delivers robust power and torque, essential for aggressive riding and rapid acceleration. The engine features a five-valve cylinder head design, optimizing airflow and combustion efficiency, which contributes to improved overall performance.

The transmission system is a five-speed manual with a wet multi-plate clutch, offering precise control and smooth shifting. The YFZ450S is equipped with a lightweight aluminum frame, enhancing agility and handling while maintaining structural integrity. The suspension system includes independent double-wishbone front suspension with fully adjustable shocks, providing 9.1 inches of travel, and a rear swingarm with a fully adjustable shock, offering 10.1 inches of travel. This setup ensures excellent shock absorption and stability on various terrains.

Braking is handled by dual hydraulic disc brakes in the front and a single hydraulic disc brake in the rear, delivering reliable stopping power. The ATV rides on 21-inch front tires and 20-inch rear tires, offering a balanced combination of grip and maneuverability. With an overall length of 71.5 inches, a width of 46.1 inches, and a height of 42.9 inches, the YFZ450S maintains a compact and aggressive stance. The seat height is 31.5 inches, and the ATV has a ground clearance of 4.4 inches, suitable for tackling rough trails and obstacles.

Weighing in at approximately 350 pounds, the Yamaha YFZ450S YFZ 450 is designed to be both lightweight and durable. It features a 2.6-gallon fuel tank, providing ample range for extended riding sessions. This model is celebrated for its combination of power, agility, and reliability, making it a top choice in the sport ATV market.

Yamaha YFZ450S YFZ 450 2004 F.A.Q.

What type of oil should be used for the Yamaha YFZ450S 2004?

For the Yamaha YFZ450S 2004, it is recommended to use Yamalube 4, 10W-40 or any high-quality motor oil with similar viscosity.

How often should the air filter be cleaned or replaced on the Yamaha YFZ450S 2004?

The air filter should be inspected and cleaned every 20 hours of operation or after riding in dusty conditions. Replace it if it's damaged or excessively dirty.

What is the correct tire pressure for the Yamaha YFZ450S 2004?

The recommended tire pressure for the Yamaha YFZ450S 2004 is 4 psi for the front tires and 4.5 psi for the rear tires.

How can I troubleshoot starting issues with the Yamaha YFZ450S 2004?

If the YFZ450S is having starting issues, check the battery for charge, inspect the spark plug for wear or fouling, and ensure the fuel system is delivering fuel properly.

What is the process for adjusting the chain tension on the Yamaha YFZ450S 2004?

To adjust the chain tension, loosen the rear axle nut, adjust the chain adjuster bolts evenly, and ensure there is 1-1.5 inches of slack at the midpoint of the chain. Tighten the axle nut after adjusting.

How do I check and refill the coolant on the Yamaha YFZ450S 2004?

To check and refill the coolant, remove the radiator cap when the engine is cool, check the coolant level, and add a 50/50 mixture of water and antifreeze if necessary.

What maintenance should be performed after every ride on the Yamaha YFZ450S 2004?

After every ride, clean the ATV, check for loose bolts, inspect the tires for damage, and lubricate the chain if needed.

What should I do if the Yamaha YFZ450S 2004 is overheating?

If the ATV is overheating, check coolant levels, ensure the radiator is not clogged, and verify that the fan is functioning properly.

How do I replace the spark plug on the Yamaha YFZ450S 2004?

To replace the spark plug, remove the seat and gas tank, disconnect the spark plug wire, use a spark plug socket to remove the old plug, and install a new one with the correct gap setting.

What is the recommended maintenance schedule for the Yamaha YFZ450S 2004?

The maintenance schedule includes checking the oil level before each ride, changing the oil and filter every 20 hours, cleaning the air filter every 20 hours, and inspecting the brakes, suspension, and tires regularly.