Yamaha YFZ45B YFZ 450 Owner's Manual

Yamaha YFZ45B YFZ 450 manual cover
Pages 154
Year 2011
Language(s)
English en

Yamaha YFZ45B YFZ 450 Specification

The Yamaha YFZ450, also known as the YFZ45B, is a high-performance all-terrain vehicle (ATV) designed for competitive racing and off-road enthusiasts. The heart of this machine is its potent 449cc liquid-cooled, 4-stroke engine, which features a titanium five-valve cylinder head for optimal efficiency and power output. This advanced engine is paired with a five-speed transmission that allows for seamless gear shifts and precise control over a variety of terrains.

The YFZ450’s chassis is constructed from lightweight aluminum, enhancing its agility and responsiveness while reducing overall weight. This is complemented by a race-ready suspension system, consisting of fully adjustable front and rear shocks that provide excellent handling and stability on rough trails. The front suspension features double A-arms with high/low-speed compression, while the rear suspension includes a cast aluminum swingarm and an adjustable linkage system.

Rider ergonomics are carefully considered, with a comfortable seat design, adjustable handlebars, and footpegs that offer superior grip and control. The YFZ450 also incorporates advanced braking systems with dual hydraulic front disc brakes and a hydraulic rear disc brake, ensuring reliable stopping power in various conditions.

The ATV’s aggressive styling is not just for show; it includes functional elements such as the sharp bodywork that improves aerodynamics and reduces mud accumulation. Additionally, the YFZ450 is equipped with a digital meter that provides essential information at a glance, including speed, hour meter, and maintenance indicators.

Overall, the Yamaha YFZ450 is engineered to deliver exceptional performance, durability, and rider comfort, making it a top choice for serious racers and off-road adventurers alike.

Yamaha YFZ45B YFZ 450 F.A.Q.

How do I properly break in a new Yamaha YFZ450 engine?

To break in a new Yamaha YFZ450 engine, start by allowing the engine to warm up completely at idle. For the first 10 hours, avoid full throttle and vary the engine speed frequently to help wear in the components evenly. Change the oil and filter after the break-in period to remove any metal particles.

What type of oil should I use for my Yamaha YFZ450?

Use a high-quality 4-stroke motorcycle oil with a viscosity rating of 10W-40 or 20W-50, depending on the ambient temperature. Ensure it's JASO MA certified for wet clutch compatibility.

How can I troubleshoot starting issues with my Yamaha YFZ450?

Check the battery charge and connections, inspect the spark plug for damage or fouling, ensure the fuel is fresh and reaches the carburetor, and verify that the air filter is clean. If issues persist, check the starter relay and solenoid.

What is the recommended tire pressure for a Yamaha YFZ450?

The recommended tire pressure for the Yamaha YFZ450 is typically around 4 psi for the front tires and 5 psi for the rear tires, but this can vary based on terrain and rider preference. Always consult the owner's manual for specific recommendations.

How often should I clean and oil the air filter on my Yamaha YFZ450?

The air filter should be cleaned and oiled every 10-15 hours of riding or more frequently in dusty conditions. Use a foam filter cleaner and ensure it's completely dry before applying air filter oil.

What are common causes of overheating in a Yamaha YFZ450?

Common causes of overheating include low coolant levels, a clogged radiator, a malfunctioning fan, or a faulty thermostat. Ensure the cooling system is free of debris and the coolant is topped up and in good condition.

How do I adjust the chain tension on my Yamaha YFZ450?

To adjust the chain tension, loosen the rear axle nut, then turn the chain adjuster bolts equally on both sides to achieve about 1-1.5 inches of slack at the middle of the chain span. Retighten the axle nut after the adjustment.

What maintenance should be performed after riding in wet or muddy conditions?

After riding in wet or muddy conditions, thoroughly wash the ATV, clean and lubricate the chain, inspect the brakes, and check for water in the airbox and other components. Lubricate all pivot points and apply a protective spray to prevent corrosion.

How do I check and adjust the valve clearance on a Yamaha YFZ450?

To check and adjust valve clearance, remove the valve cover and use a feeler gauge to measure the gap between the cam lobes and the lifters. Adjust as necessary using a shim kit to achieve the specified clearance in the service manual.

What are the symptoms of a failing clutch in a Yamaha YFZ450?

Symptoms of a failing clutch include slipping under load, difficulty engaging gears, a spongy clutch lever feel, and unusual noises during operation. Inspect the clutch plates and springs for wear and replace them as needed.