Yamaha TT-R90S, TT-R90ES 2004 Owner's Manual

Yamaha TT-R90S, TT-R90ES 2004 manual cover

Pages 168

Year 2004

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of 168

Yamaha TT-R90S, TT-R90ES 2004 Specification

The Yamaha TT-R90S and TT-R90ES 2004 models are designed as entry-level off-road motorcycles, ideal for young riders transitioning from smaller bikes. Both models are powered by a 89cc, air-cooled, SOHC, 4-stroke engine, providing a reliable and manageable power output for novice riders. The engine is mated to a 3-speed automatic clutch transmission, simplifying the learning curve for beginners by removing the need for manual clutch operation.

The chassis is constructed from a steel backbone frame, ensuring durability and resilience on rough terrains. The suspension system features a telescopic front fork with 96mm of travel and a monocross rear suspension with 71mm of travel, offering a balance between comfort and control. The braking system consists of a 95mm drum brake at the front and an 80mm drum brake at the rear, providing sufficient stopping power for the bike's intended use.

The TT-R90S and TT-R90ES both have a seat height of 654mm, making them accessible for shorter riders. The wheelbase measures 1031mm, contributing to the bike’s stability and ease of handling. With a fuel tank capacity of 5.5 liters, these models are capable of extended riding sessions without frequent refueling.

One of the primary differences between the two models is the electric start feature on the TT-R90ES, enhancing convenience for young riders. Both bikes feature knobby tires designed for off-road use, ensuring adequate traction on various surfaces. The overall weight of the TT-R90S is 57kg, while the TT-R90ES is slightly heavier due to the electric start mechanism.

These models are built with a focus on safety, ease of use, and durability, making them suitable choices for young off-road enthusiasts looking to develop their riding skills.

Yamaha TT-R90S, TT-R90ES 2004 F.A.Q.

What is the recommended oil type for the Yamaha TT-R90S and TT-R90ES 2004?

The recommended oil type for the Yamaha TT-R90S and TT-R90ES 2004 is SAE 10W-30 or 10W-40, depending on the ambient temperature. Always use high-quality engine oil designed for four-stroke motorcycles.

How often should I change the oil in my Yamaha TT-R90S?

It is recommended to change the oil every 6 months or every 1,000 kilometers (approximately 621 miles), whichever comes first. Regular oil changes ensure optimal engine performance and longevity.

How do I adjust the chain tension on the TT-R90ES?

To adjust the chain tension on the TT-R90ES, first, place the bike on a stand. Loosen the axle nut slightly, then adjust the chain adjusters on both sides of the swingarm equally until the chain has about 20-30 mm of slack. Finally, retighten the axle nut securely.

What is the correct tire pressure for the Yamaha TT-R90S?

The correct tire pressure for the Yamaha TT-R90S is 15 psi for the front tire and 15 psi for the rear tire. Proper tire pressure ensures better handling and fuel efficiency.

How can I troubleshoot starting issues with my TT-R90ES?

If your TT-R90ES is having starting issues, check the following: ensure the fuel valve is open, the choke is in the correct position, the battery is charged, and the spark plug is clean and properly gapped. If issues persist, consult a professional mechanic.

How do I clean the air filter on the TT-R90S?

To clean the air filter on the TT-R90S, remove the seat and the air filter cover. Take out the air filter and wash it with mild soap and water. Allow it to dry completely before applying a light coat of air filter oil. Reinstall it securely.

What should I do if the engine overheats on my TT-R90ES?

If the engine overheats, turn off the motorcycle and let it cool down. Check for obstructions in the airflow, ensure the oil level is adequate, and inspect for coolant leaks if applicable. Avoid running the engine in extremely hot conditions for prolonged periods.

How can I improve the suspension settings on my TT-R90S for off-road use?

To improve suspension for off-road use, adjust the preload and damping settings according to your weight and riding style. Consider upgrading to stiffer springs or aftermarket suspension components for enhanced performance.

What maintenance should be done before storing the TT-R90ES for winter?

Before storing the TT-R90ES for winter, perform the following maintenance: change the oil and filter, clean and lube the chain, stabilize the fuel, disconnect or remove the battery, and cover the bike to protect it from dust and moisture.

How do I replace the spark plug on my Yamaha TT-R90S?

To replace the spark plug on the TT-R90S, first, remove the spark plug cap. Use a spark plug socket to unscrew the old plug. Check the gap on the new spark plug, then carefully screw it into the cylinder head by hand before tightening it with the socket. Reattach the spark plug cap securely.