Yamaha TT-R90ER 2003 Owner's Manual

Pages 156

Year 2003

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Yamaha TT-R90ER 2003 Specification

The Yamaha TT-R90ER 2003 is a robust off-road motorcycle designed for young riders and beginners seeking an introductory experience into the world of dirt biking. Engineered for reliability and ease of use, this model features an 89cc, air-cooled, SOHC, 4-stroke, single-cylinder engine that delivers a smooth and manageable power output, making it ideal for novice riders. The engine is paired with a three-speed automatic-clutch transmission, simplifying the riding experience by eliminating the need for manual clutch operation and allowing riders to focus on mastering their skills.

The motorcycle's suspension system consists of a telescopic front fork with 3.8 inches of travel and a monocross rear suspension with 3.4 inches of travel, providing a balanced and comfortable ride over various terrains. The frame is constructed from a high-tensile steel backbone, ensuring durability and stability during off-road excursions. The seat height is set at a manageable 24.6 inches, accommodating a wide range of rider heights and promoting confidence and control.

Braking is handled by drum brakes on both the front and rear wheels, delivering reliable stopping power under different riding conditions. The TT-R90ER also features knobby tires designed to offer excellent traction on dirt trails, enhancing the overall riding experience. Additional features include an electric start system for ease of use and a lightweight design, with a wet weight of approximately 137 pounds, making it easy to handle for younger or smaller riders.

In summary, the Yamaha TT-R90ER 2003 is a well-rounded, beginner-friendly off-road motorcycle that combines ease of operation, reliable performance, and durable construction, making it an excellent choice for entry-level riders looking to develop their skills in off-road motorcycling.

Yamaha TT-R90ER 2003 F.A.Q.

What is the recommended oil type for the Yamaha TT-R90ER 2003?

The recommended oil type for the Yamaha TT-R90ER 2003 is SAE 10W-30, or any high-quality engine oil that meets or exceeds the API service classification of SF.

How often should the air filter be cleaned or replaced?

The air filter should be cleaned every 20 hours of operation or more frequently if ridden in dusty conditions. It should be replaced if it is damaged or excessively dirty.

What is the correct spark plug gap for the Yamaha TT-R90ER 2003?

The correct spark plug gap for the Yamaha TT-R90ER 2003 is 0.6 - 0.7 mm (0.024 - 0.028 inches).

How do I adjust the chain tension on the Yamaha TT-R90ER 2003?

To adjust the chain tension, loosen the axle nut, adjust the chain adjusters equally on both sides until the chain has 10-15 mm of slack, then retighten the axle nut securely.

What is the fuel capacity of the Yamaha TT-R90ER 2003?

The fuel capacity of the Yamaha TT-R90ER 2003 is approximately 5 liters (1.32 gallons).

How can I troubleshoot starting issues with the Yamaha TT-R90ER 2003?

If the bike is not starting, check the fuel level, ensure the fuel valve is on, inspect the spark plug for fouling, and verify that the choke is properly engaged.

What is the recommended tire pressure for the Yamaha TT-R90ER 2003?

The recommended tire pressure is 15 psi for the front tire and 15 psi for the rear tire.

How should I store the Yamaha TT-R90ER 2003 during the off-season?

For off-season storage, clean the bike thoroughly, drain the fuel system, remove the battery and store it in a cool, dry place, and cover the bike to protect it from dust and moisture.

How do I change the oil in the Yamaha TT-R90ER 2003?

To change the oil, warm up the engine, place a drain pan under the engine, remove the drain bolt, let the oil drain completely, replace the drain bolt, and refill with fresh oil.

What are common signs of a worn-out clutch on the Yamaha TT-R90ER 2003?

Common signs include difficulty shifting gears, slipping clutch, and a burning smell from the engine area. Inspect the clutch plates and springs if you experience these issues.