Yamaha YFM66FAT Grizzly 660 2005 Owner's Manual

Yamaha YFM66FAT Grizzly 660 2005 manual cover

Pages 200

Year 2005

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Yamaha YFM66FAT Grizzly 660 2005 Specification

The Yamaha YFM66FAT Grizzly 660, released in 2005, stands as a robust and versatile all-terrain vehicle (ATV) designed for both recreational use and demanding utility tasks. This model is powered by a 660cc liquid-cooled, 4-stroke, single-cylinder engine that delivers substantial torque and reliable performance across varied terrains. The engine is coupled with a fully automatic Ultramatic transmission, incorporating Yamaha's engine braking system for enhanced control during descents.

The Grizzly 660's suspension system is engineered for superior ride comfort and handling, featuring independent double wishbone suspension with 5-way preload-adjustable shocks both at the front and rear. This setup provides impressive ground clearance and the ability to tackle rough landscapes with ease. For braking, the ATV is equipped with dual hydraulic front disc brakes and a sealed, oil-bathed, multi-disc rear brake, ensuring dependable stopping power in diverse conditions.

The driveline incorporates Yamaha's On-Command 2WD/4WD system, allowing seamless switching between two-wheel drive and four-wheel drive modes, and includes a differential lock for maximum traction in challenging situations. This system enhances the vehicle's adaptability to varying off-road scenarios.

The Grizzly 660 also emphasizes rider comfort and usability with features such as a spacious, ergonomically designed seat, comprehensive LCD instrumentation, and ample storage options. Its rugged chassis and bodywork are designed to withstand harsh environments, with a large-capacity fuel tank to extend the operational range.

With a dry weight of approximately 600 pounds, the Yamaha YFM66FAT Grizzly 660 balances power, durability, and ease of handling, making it a dependable choice for ATV enthusiasts and professionals requiring a reliable off-road vehicle.

Yamaha YFM66FAT Grizzly 660 2005 F.A.Q.

How do I perform an oil change on a Yamaha YFM66FAT Grizzly 660 2005?

To perform an oil change, first warm up the engine for a few minutes, then turn it off. Place an oil pan beneath the engine and remove the drain bolt to drain the old oil. Replace the drain bolt and remove the old oil filter, replacing it with a new one. Finally, refill with the recommended oil type and check for leaks.

What type of coolant should I use for the Grizzly 660 2005?

Use a high-quality ethylene glycol-based antifreeze coolant mixed with distilled water in a 1:1 ratio. This will help prevent corrosion and ensure optimal cooling performance.

How can I troubleshoot a starting issue with my Grizzly 660 2005?

Check the battery charge and connections first. Ensure the fuel is fresh and the fuel valve is open. Inspect the spark plug for fouling or wear, and clean or replace it if necessary. If the ATV still won't start, check the ignition system and fuel delivery components.

What is the recommended tire pressure for the Yamaha Grizzly 660 2005?

The recommended tire pressure for the Grizzly 660 is typically 5 psi for the front tires and 5 psi for the rear tires. Always consult the owner's manual for specific recommendations.

How do I adjust the carburetor on my Grizzly 660 2005?

To adjust the carburetor, locate the air/fuel mixture screw and idle speed screw. Adjust the air/fuel mixture screw for a smooth idle and optimal performance. Then adjust the idle speed screw to set the engine idle to the specified RPM.

What maintenance schedule should I follow for my Grizzly 660 2005?

Perform regular maintenance including oil changes every 6 months or 600 miles, checking and replacing the air filter as needed, inspecting brake pads and adjusting them, and checking all fluid levels regularly. Follow the detailed maintenance schedule in the owner's manual.

How do I replace the drive belt on my Yamaha Grizzly 660 2005?

To replace the drive belt, remove the belt cover by unscrewing the bolts. Slide the belt off the pulleys and replace it with a new one, ensuring it's seated correctly on both pulleys. Reattach the belt cover securely.

What are the common causes of overheating in the Grizzly 660 2005?

Common causes of overheating include a low coolant level, a clogged radiator, a faulty thermostat, or a malfunctioning water pump. Regularly check and maintain the cooling system to prevent overheating.

How do I clean and maintain the air filter on my Grizzly 660 2005?

Remove the air filter cover and take out the filter. If it's a foam filter, wash it with warm soapy water, rinse thoroughly, and let it dry. Apply air filter oil before reinstalling. For paper filters, replace if dirty.

How can I test the battery on my Yamaha Grizzly 660 2005?

Use a multimeter to test the battery voltage. A fully charged battery should read around 12.6 volts or higher. If the voltage is low, try charging the battery. If it fails to hold a charge, consider replacing it.