Yamaha YZ450FS 2004 Owner's Manual

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Year 2004

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Yamaha YZ450FS 2004 Specification

The Yamaha YZ450FS 2004 is a high-performance motocross motorcycle designed for competitive racing. At its core, the YZ450FS features a liquid-cooled, 449cc, four-stroke, single-cylinder engine that delivers robust power and torque across a broad rpm range. This engine employs a five-valve cylinder head for improved breathing and efficiency, paired with a Keihin FCR carburetor to ensure precise fuel delivery.

The bike's transmission is a five-speed constant mesh, allowing smooth and reliable gear changes under various riding conditions. The frame is constructed from lightweight aluminum, providing optimal rigidity and handling. This chassis design is complemented by fully adjustable suspension components, including a 48mm inverted front fork and a rear monoshock, both designed by Kayaba, offering superior traction and control over rough terrain.

Braking is handled by a powerful wave-style disc brake system, featuring a 250mm front disc and a 245mm rear disc for consistent stopping power. The YZ450FS also boasts a narrow, ergonomically designed seat and bodywork to facilitate rider movement and enhance comfort during long rides. The bike's overall weight is kept low, improving agility and responsiveness on the track.

Additional features include a titanium exhaust system for reduced weight and improved performance, along with high-quality, durable components that ensure the motorcycle can withstand the rigors of competitive racing. The Yamaha YZ450FS 2004 stands out as a top choice for serious motocross enthusiasts, offering a blend of power, agility, and durability.

Yamaha YZ450FS 2004 F.A.Q.

What type of oil is recommended for the Yamaha YZ450FS 2004?

The recommended oil for the Yamaha YZ450FS 2004 is 10W-40 or 20W-50, depending on the climate and riding conditions. Always ensure the oil is suitable for wet clutches.

How often should I change the air filter on my YZ450FS 2004?

The air filter should be checked and cleaned after every ride, especially in dusty conditions. Replace it if it shows signs of wear or damage.

What is the correct spark plug gap for the YZ450FS 2004?

The correct spark plug gap for the Yamaha YZ450FS 2004 is 0.7-0.8 mm (0.028-0.031 inches).

How do I adjust the suspension on my Yamaha YZ450FS 2004 for better handling?

To adjust the suspension, refer to the owner's manual for baseline settings. You can fine-tune the compression and rebound damping based on your weight and riding style.

What are common starting issues with the YZ450FS 2004 and how can they be resolved?

Common starting issues include a faulty spark plug, fuel delivery problems, or a weak battery. Check each component and replace or repair as necessary.

How can I prevent overheating in my Yamaha YZ450FS 2004?

Ensure the radiator is clean and unobstructed, use the correct coolant mix, and check for leaks. Regular maintenance of the cooling system can prevent overheating.

What is the recommended tire pressure for the YZ450FS 2004?

The recommended tire pressure for the Yamaha YZ450FS 2004 is typically 12 psi for the front tire and 12-14 psi for the rear tire, but adjust based on terrain and rider preference.

How do I properly clean the carburetor on my YZ450FS 2004?

To clean the carburetor, remove it from the bike, disassemble it, and use a carburetor cleaner to remove all debris. Reassemble and reinstall it carefully.

What are the torque specifications for the cylinder head bolts on the YZ450FS 2004?

The torque specification for the cylinder head bolts on the Yamaha YZ450FS 2004 is 29 ft-lbs (39 Nm). Follow the specific tightening sequence outlined in the service manual.

How can I diagnose electrical issues on my Yamaha YZ450FS 2004?

Check the battery voltage, inspect all wiring for damage, and ensure all connections are secure. Use a multimeter to test components like the ignition coil and stator.