Yamaha TT-R90ET 2004 Owner's Manual

Pages 168

Year 2004

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Yamaha TT-R90ET 2004 Specification

The Yamaha TT-R90ET 2004 is a robust off-road motorcycle designed for young riders and beginners seeking an introduction to trail riding. It features a reliable air-cooled, four-stroke, single-cylinder engine with a displacement of 89cc, delivering smooth and manageable power suitable for new riders. The engine is paired with a three-speed transmission equipped with an automatic clutch, simplifying gear changes and ensuring a user-friendly riding experience.

The chassis of the TT-R90ET is constructed from high-tensile steel, providing durability and stability on rough terrains. The suspension system includes a telescopic front fork with a travel of approximately 110mm and a rear single shock absorber, offering adequate cushioning and control over bumps and uneven surfaces. The motorcycle is equipped with drum brakes on both the front and rear wheels, ensuring reliable stopping power.

Ergonomically, the TT-R90ET is designed with a low seat height of around 22.6 inches, making it accessible for younger and shorter riders. The bike's total weight is approximately 127 pounds, which contributes to its agility and ease of handling. The fuel tank has a capacity of 1.1 gallons, providing sufficient range for extended trail rides without frequent refueling.

Aesthetically, the Yamaha TT-R90ET features a sporty design with distinctive Yamaha graphics and a blue color scheme, enhancing its visual appeal. The motorcycle comes with knobby tires that offer excellent traction on dirt and gravel paths. Additional features include a chain guard and a heat shield on the exhaust, emphasizing safety for novice riders.

Overall, the Yamaha TT-R90ET 2004 is a well-rounded, beginner-friendly trail bike that combines ease of use with reliable performance, making it an excellent choice for young enthusiasts looking to explore off-road riding.

Yamaha TT-R90ET 2004 F.A.Q.

What type of oil should I use for my Yamaha TT-R90ET 2004?

For the Yamaha TT-R90ET 2004, it is recommended to use a high-quality 10W-40 four-stroke motorcycle oil designed for wet clutches.

How often should I change the oil in my TT-R90ET?

The oil should be changed every 6 months or 1,000 miles, whichever comes first. It's crucial to regularly check the oil level and quality between changes.

What is the correct tire pressure for the Yamaha TT-R90ET 2004?

The recommended tire pressure for the front tire is 15 psi, and for the rear tire, it is 15 psi. Always check the tire pressure when the tires are cold.

How do I troubleshoot starting issues with my TT-R90ET?

If your TT-R90ET won't start, check the fuel level, ensure the kill switch is in the 'RUN' position, inspect the spark plug for fouling, and verify that the battery is charged if applicable.

What kind of spark plug does the TT-R90ET use?

The Yamaha TT-R90ET 2004 uses an NGK C7HSA spark plug. Ensure it is properly gapped at 0.6 - 0.7 mm before installation.

How do I adjust the chain tension on my Yamaha TT-R90ET?

To adjust the chain tension, place the bike on a stand, loosen the axle nut, adjust the chain adjusters to achieve 30-40 mm of slack, and then retighten the axle nut securely.

What regular maintenance tasks should I perform on my TT-R90ET?

Regular maintenance includes changing the oil, cleaning the air filter, checking and adjusting the chain tension, inspecting brakes, and ensuring all bolts and nuts are properly tightened.

How can I clean the air filter on my TT-R90ET?

Remove the air filter cover, gently take out the filter, wash it with a non-flammable cleaning solvent, let it dry completely, apply air filter oil, and reinstall it.

What steps should I follow to winterize my Yamaha TT-R90ET?

To winterize your TT-R90ET, clean the bike thoroughly, change the oil, add fuel stabilizer, remove the battery and store it in a warm place, and cover the bike to protect it from dust.

How do I check and adjust the valve clearance on my TT-R90ET?

First, remove the seat and tank for access. Rotate the engine to TDC on the compression stroke, check the clearance with a feeler gauge, and adjust the valves as needed by loosening the lock nut and turning the adjuster screw.