Yamaha YZ85S 2003 Owner's Manual

Pages 242

Year 2004

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Yamaha YZ85S 2003 Specification

The Yamaha YZ85S 2003 is a high-performance motocross bike designed for young riders who are transitioning from smaller, beginner models to more advanced racing machines. It features a powerful 84.7cc, liquid-cooled, 2-stroke engine with a reed valve induction system, providing robust acceleration and speed suitable for competitive racing environments. The engine is paired with a 6-speed manual transmission, allowing for precise control over power delivery and enhancing the bike's versatility across various track conditions.

The chassis of the YZ85S is constructed from a lightweight yet durable steel frame, optimizing the balance between strength and agility. This design ensures that young riders can handle the bike with confidence while maintaining stability during high-speed maneuvers and jumps. The suspension system includes a fully adjustable 36mm inverted telescopic front fork and a monocross rear shock with a progressive linkage system. These components offer superior handling and shock absorption, enabling the bike to tackle rough terrains and landings with ease.

Braking is managed by a robust system comprising a 220mm front disc brake and a 190mm rear disc brake, both providing reliable stopping power and control. The bike's ergonomics are tailored for youth riders, featuring a slim seat, adjustable handlebars, and strategically positioned foot pegs to ensure a comfortable and controlled riding posture. The YZ85S also comes equipped with knobby tires designed to offer maximum traction on dirt tracks and a lightweight aluminum wheelset for enhanced performance.

Overall, the Yamaha YZ85S 2003 is engineered to deliver exceptional performance, durability, and handling, making it an ideal choice for young motocross enthusiasts aiming to hone their skills and compete at higher levels.

Yamaha YZ85S 2003 F.A.Q.

What is the recommended oil type for a 2003 Yamaha YZ85S?

The recommended oil type for the 2003 Yamaha YZ85S is a high-quality 2-stroke engine oil. Yamaha recommends using Yamalube 2R or an equivalent oil that meets JASO FC or ISO-EGD standards.

How often should I change the transmission oil on my Yamaha YZ85S?

It is recommended to change the transmission oil every 10 hours of riding or after every race to ensure optimal performance and prolong the life of the transmission components.

What is the correct spark plug gap for the YZ85S 2003 model?

The correct spark plug gap for the 2003 Yamaha YZ85S is 0.7-0.8 mm (0.028-0.031 inches). Ensure to check and adjust the gap when replacing the spark plug.

How do I troubleshoot starting issues with my Yamaha YZ85S?

To troubleshoot starting issues, check the spark plug for fouling, ensure the fuel is fresh, inspect the air filter for clogs, and verify all electrical connections are secure. If the problem persists, inspect the carburetor for blockages or wear.

What is the correct tire pressure for a 2003 Yamaha YZ85S?

The recommended tire pressure for the front tire is 12 psi and for the rear tire is 12-15 psi, depending on the terrain and rider preference.

How can I maintain the chain on my YZ85S 2003?

Regularly clean the chain with a suitable chain cleaner and apply a high-quality chain lubricant. Check the chain tension and adjust as necessary, ensuring there is about 1.2-1.6 inches of slack.

What should I do if my Yamaha YZ85S is overheating?

If your YZ85S is overheating, check the coolant level and top up if necessary. Inspect the radiator for blockages and clean as needed. Ensure the cooling system is free from leaks and the water pump is functioning properly.

How do I adjust the suspension on my 2003 YZ85S for better handling?

To adjust the suspension, start by setting the sag correctly. Adjust the front fork compression and rebound settings according to your riding style and terrain. For the rear shock, adjust the preload, compression, and rebound settings to improve handling and comfort.

What are the signs that the carburetor on my YZ85S needs cleaning?

Signs that your carburetor needs cleaning include poor engine performance, difficulty starting, engine sputtering, and a noticeable decrease in fuel efficiency. Regular maintenance and cleaning can prevent these issues.

How do I properly store my Yamaha YZ85S during the off-season?

To store your YZ85S, clean it thoroughly and lubricate all moving parts. Drain the fuel or use a fuel stabilizer, remove the spark plug and add a few drops of oil into the cylinder, then reinstall the spark plug. Keep the bike in a dry, cool place and cover it to protect against dust and moisture.