Yamaha YFM660FS Ultramatic Grizzly 660 2004 Owner's Manual

Yamaha YFM660FS Ultramatic Grizzly 660 2004 manual cover

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Year 2004

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Yamaha YFM660FS Ultramatic Grizzly 660 2004 Specification

The Yamaha YFM660FS Ultramatic Grizzly 660 2004 is a high-performance all-terrain vehicle (ATV) designed for both recreational and utility use. It features a robust 660cc liquid-cooled, four-stroke, single-cylinder engine that delivers substantial power and torque, providing excellent off-road capabilities. The engine is equipped with a five-valve head and a 10:1 compression ratio, ensuring efficient combustion and optimal performance.

The Ultramatic automatic transmission system offers seamless power delivery and includes a centrifugal clutch for smooth engagement and a sprag clutch for all-wheel downhill engine braking. This transmission system enhances the Grizzly 660's versatility, making it suitable for various terrains and conditions.

The ATV’s chassis is constructed from a durable steel frame that supports a sophisticated independent double-wishbone suspension system, featuring 5-way preload-adjustable shocks. This setup allows for a comfortable and stable ride, even on rough trails. The front suspension provides 7.1 inches of travel, while the rear suspension offers 9.5 inches, ensuring excellent ground clearance and obstacle traversing capability.

For braking, the Grizzly 660 is equipped with dual hydraulic front disc brakes and a sealed rear brake system, delivering reliable stopping power in various environments. The ATV rides on rugged 25-inch tires, offering superior traction and stability.

Additional features include a digital LCD display providing essential information such as speed, fuel level, and maintenance indicators, alongside a robust cargo rack system for practical load-carrying capabilities. The Grizzly 660 also includes a winch-ready design and a standard hitch for towing needs.

In summary, the Yamaha YFM660FS Ultramatic Grizzly 660 2004 stands out with its powerful engine, advanced transmission, durable suspension, and practical features, making it a versatile and reliable choice for ATV enthusiasts and professionals alike.

Yamaha YFM660FS Ultramatic Grizzly 660 2004 F.A.Q.

How often should I change the oil in my Yamaha YFM660FS Ultramatic Grizzly 660 2004?

It is recommended to change the oil every 3,000 miles or every 6 months, whichever comes first. Regular oil changes help maintain engine performance and longevity.

What type of oil is best for the Yamaha Grizzly 660?

For the Yamaha Grizzly 660, it's best to use Yamalube 4W or another high-quality 10W-40 4-stroke engine oil that meets or exceeds JASO MA standards.

How can I troubleshoot starting issues with my Grizzly 660?

If your Grizzly 660 won't start, check the battery charge, inspect the spark plug, ensure the fuel is fresh, and check the fuel lines for clogs. If the problem persists, consult the service manual or a professional mechanic.

What should I do if my Grizzly 660 overheats?

If your ATV overheats, stop the engine immediately and let it cool down. Check for coolant levels, radiator obstructions, and ensure the fan is operational. Refill coolant if necessary and inspect for leaks.

How do I adjust the brakes on my Yamaha Grizzly 660?

To adjust the brakes, locate the brake adjuster screw near the brake lever. Turn the screw clockwise to tighten or counterclockwise to loosen. Ensure there is a slight free play before the brakes engage.

What is the proper tire pressure for the Grizzly 660?

The recommended tire pressure for the Yamaha Grizzly 660 is typically 5 psi for the front tires and 5 psi for the rear tires. Always check the owner's manual to confirm.

How can I maintain the drive belt on my Grizzly 660?

Regularly inspect the drive belt for wear or damage. Clean the belt and pulleys with a dry cloth, and replace the belt if it shows signs of fraying, cracking, or loss of tension.

What are the common signs of a failing carburetor on the Grizzly 660?

Common signs include difficulty starting, poor idling, engine stalling, and reduced performance. Regular cleaning and maintenance of the carburetor can prevent these issues.

How do I store my Grizzly 660 for the winter?

To winterize your Grizzly 660, clean the ATV thoroughly, change the oil and filter, add a fuel stabilizer, inflate tires to the recommended pressure, and disconnect the battery. Store in a dry, covered area.

What is the correct spark plug gap for the Yamaha Grizzly 660?

The correct spark plug gap for the Yamaha Grizzly 660 is typically 0.7-0.8 mm (0.028-0.031 inches). Always refer to the service manual for precise specifications.