Yamaha YZ426FM 2000 Owner's Manual

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Year 2000

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Yamaha YZ426FM 2000 Specification

The Yamaha YZ426FM 2000 is a high-performance motocross bike engineered for competitive racing. It is powered by a 426cc, liquid-cooled, four-stroke, single-cylinder engine that delivers robust torque and impressive power across the RPM range. The engine is equipped with a five-valve cylinder head for efficient air intake and exhaust, enhancing overall performance. It features a Keihin FCR39 carburetor, which provides precise fuel delivery for optimal throttle response.

The YZ426FM's frame is constructed from lightweight aluminum, contributing to a low overall weight of approximately 250 pounds, which enhances maneuverability and handling. The bike is fitted with fully adjustable suspension; the front features 46mm Kayaba inverted forks with 11.8 inches of travel, while the rear sports a Kayaba monoshock with similar travel distance, ensuring superior shock absorption and stability on varied terrains.

Braking is managed by a 250mm hydraulic disc at the front and a 245mm disc at the rear, providing reliable stopping power. The bike's ergonomics are designed for rider comfort and control, with a flat seat and slim profile that allow for easy movement during aggressive riding. The fuel tank capacity stands at 2.1 gallons, which is suitable for extended racing sessions.

The Yamaha YZ426FM 2000 also features a five-speed transmission with a multiplate wet clutch, allowing for smooth and reliable gear shifts. This model is renowned for its durability and competitive edge, making it a preferred choice for serious motocross enthusiasts. With its blend of advanced engineering and high-quality components, the YZ426FM 2000 continues to be a benchmark in the motocross community.

Yamaha YZ426FM 2000 F.A.Q.

How often should I change the oil in my Yamaha YZ426FM 2000?

It's recommended to change the oil every 15-20 hours of riding or after every two or three rides, depending on your riding conditions.

What is the correct spark plug gap for the YZ426FM 2000?

The correct spark plug gap for the Yamaha YZ426FM 2000 is 0.7-0.8 mm (0.028-0.031 inches).

How do I adjust the chain tension on my YZ426FM 2000?

To adjust the chain tension, place the bike on a stand, loosen the rear axle nut, adjust the chain adjusters evenly on both sides, and ensure there's about 1.2 inches (30 mm) of slack in the chain.

What type of coolant should I use for my Yamaha YZ426FM 2000?

Use a high-quality ethylene glycol-based coolant mixed with distilled water at a 50:50 ratio for optimal performance.

How can I troubleshoot starting problems with my YZ426FM 2000?

Check the fuel supply, inspect the spark plug for wear or fouling, ensure the kill switch is in the correct position, and verify that the carburetor is clean and properly adjusted.

What is the recommended tire pressure for the YZ426FM 2000?

For the Yamaha YZ426FM 2000, the recommended tire pressure is 15 psi for both front and rear tires.

How do I maintain the air filter on my YZ426FM 2000?

Clean the air filter after every ride in dusty conditions. Use a mild detergent, allow it to dry completely, and apply air filter oil before reinstalling.

What should I do if my YZ426FM 2000 overheats?

Stop the bike immediately, let it cool down, check the coolant level, inspect the radiator for blockages, and ensure the coolant system is functioning properly.

How can I enhance the performance of my Yamaha YZ426FM 2000?

Consider upgrading the exhaust system, fine-tuning the carburetor, and using high-quality performance parts like an aftermarket air filter and spark plug.

What are common signs of clutch wear on the YZ426FM 2000?

Common signs include difficulty in shifting gears, a slipping clutch, or a change in the clutch lever feel. Inspect clutch plates and springs if these symptoms appear.