Yamaha TT-R90R 2003 Owner's Manual

Pages 134

Year 2003

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Yamaha TT-R90R 2003 Specification

The Yamaha TT-R90R 2003 is a compact off-road motorcycle designed for young riders and beginners, delivering a balance of performance and user-friendly features. Powered by an air-cooled, four-stroke, 89cc SOHC engine, it offers reliable power and smooth acceleration, making it suitable for a variety of terrains. The engine is mated to a three-speed automatic-clutch transmission, simplifying gear changes and allowing riders to focus on mastering their riding skills.

The bike's suspension system includes a telescopic front fork with 96mm of travel and a single rear shock with 71mm of travel, providing a comfortable and controlled ride over rough surfaces. A 14-inch front wheel and 12-inch rear wheel, both with knobby tires, enhance traction and stability on dirt trails. The TT-R90R's frame is constructed from steel, ensuring durability while keeping the overall weight manageable at approximately 125 pounds.

Braking is handled by drum brakes on both the front and rear, offering reliable stopping power in various conditions. The seat height of 24.6 inches accommodates younger riders, while a ground clearance of 7.1 inches allows for obstacle navigation without compromising stability. The bike features a fuel tank capacity of 1.1 gallons, ensuring extended riding sessions between refuels.

In terms of ergonomics, the TT-R90R includes a comfortable, flat seat and a user-friendly layout of controls, making it accessible for new riders. The design emphasizes ease of maintenance, with accessible components and a straightforward layout. Overall, the Yamaha TT-R90R 2003 combines robust engineering with practical features to provide an excellent entry-level off-road riding experience.

Yamaha TT-R90R 2003 F.A.Q.

What is the recommended oil type for the Yamaha TT-R90R 2003?

The recommended oil type for the Yamaha TT-R90R 2003 is SAE 10W-30 or 10W-40, suitable for 4-stroke motorcycle engines.

How often should the air filter be cleaned or replaced on the TT-R90R 2003?

The air filter should be checked and cleaned every 20 hours of riding time, and replaced if necessary, especially if riding in dusty conditions.

What is the proper tire pressure for optimal performance on the TT-R90R 2003?

The recommended tire pressure for the Yamaha TT-R90R 2003 is 15 psi for the front tire and 15 psi for the rear tire.

How can I troubleshoot starting issues with the Yamaha TT-R90R 2003?

To troubleshoot starting issues, check the fuel supply, ensure the spark plug is clean and properly gapped, and verify the operation of the choke.

What is the valve clearance specification for the TT-R90R 2003?

The valve clearance for the Yamaha TT-R90R 2003 should be set to 0.05 mm (0.002 in) for both intake and exhaust valves.

How do I adjust the chain tension on my Yamaha TT-R90R 2003?

To adjust the chain tension, ensure the motorcycle is on a stand, loosen the axle nut, adjust the tensioners equally on both sides, and tighten the axle nut to secure the position.

What maintenance checks should I perform regularly on the TT-R90R 2003?

Regular maintenance checks should include inspecting the brakes, chain, tire pressure, oil level, air filter, and ensuring all bolts are tightened securely.

How can I improve the suspension performance on my Yamaha TT-R90R 2003?

To improve suspension performance, consider adjusting the preload settings, checking for any leaks, and ensuring the suspension components are in good condition.

What should I do if the TT-R90R 2003 is overheating?

If the TT-R90R 2003 is overheating, check the coolant levels, ensure there is no obstruction in the airflow to the engine, and inspect the radiator for any damage.

How do I replace the spark plug on the Yamaha TT-R90R 2003?

To replace the spark plug, remove the spark plug cap, use a spark plug wrench to unscrew the plug, replace it with a new one, and ensure it is properly gapped before installation.