Sun Coast Cycle Sports offers used OEM parts for the Yamaha Grizzly 660, the second-generation big-bore utility ATV Yamaha produced from 2002 through 2008. Replacing the original Grizzly 600, the 660 brought a larger 660cc five-valve single-cylinder engine derived from the Raptor 660 sport quad, independent rear suspension, and improved handling to the Grizzly platform. The 660 retained the Ultramatic CVT transmission and selectable 2WD/4WD with locking front differential that defined the Grizzly name. Every part in our inventory is sourced from a complete donor machine, assessed by our Odessa, Florida technicians, and listed with its own photos and SKU.
Grizzly 660 generation and parts compatibility
The Grizzly 660 was produced from 2002 to 2008. The first model year (2002) experienced some teething issues including fuel overheating that were addressed through recalls and running changes. From 2004 onward, the platform was largely stable with only color and minor cosmetic updates.
The Grizzly 660 uses a 660cc SOHC five-valve single-cylinder engine that shares its architecture with the Raptor 660 sport ATV. Some engine internals (cylinder, piston, head, valvetrain) may cross between the Grizzly 660 and Raptor 660, though the two have different tuning, intake, and exhaust configurations. The Grizzly 660 does not share parts with the Grizzly 600 (different engine, different rear suspension design) or the Grizzly 700 (different displacement, fuel injection vs. carburetor). The frame, bodywork, and most ancillary systems are Grizzly 660-specific. Within the 660 production run (2002-2008), parts interchange freely across all years.
Common Grizzly 660 failure points and replacement parts
Fuel overheating (2002-2003): Like the Grizzly 600 before it, early Grizzly 660 models experienced fuel overheating and vapor lock in hot weather. Yamaha addressed this with vented side panels and a heat reflector. By 2004, the issue was largely resolved. Check for updated side panels on any used 2002-2003 model.
CVT belt wear: The Ultramatic CVT belt remains the primary drivetrain wear component. Mud, water, and heavy loads accelerate belt deterioration. The Grizzly 660's more powerful engine can stress the belt harder than the 600, making regular inspection especially important.
Carburetor issues: The 660 uses a single Mikuni carburetor that is prone to the same ethanol-related fouling and varnish problems as all carbureted ATVs of this era. Machines that sit idle between seasons almost always need carb service to run properly.
Wheel bearing wear: The independent rear suspension introduced on the 660 added rear wheel bearings that are exposed to mud, water, and trail debris. Both front and rear bearings are common replacement items, especially on machines used in wet environments. A clicking or grinding noise that varies with wheel speed is the primary symptom.
Steering component wear: Tie rod ends and ball joints in the front suspension can wear and develop play over time, causing vague steering and wandering. These should be inspected regularly and replaced when play is detected.
Commonly replaced Grizzly 660 parts
- CVT drive belt and clutch components
- Carburetor rebuild kit and fuel system parts
- Wheel bearings (front and rear)
- Tie rod ends and ball joints
- CV boots and CV joints
- Brake pads and brake calipers
- Plastics, fenders, and bodywork
- Starter motor and starter relay
- Exhaust system and muffler
Frequently asked questions
Q: Does the Grizzly 660 share engine parts with the Raptor 660?
The Grizzly 660 and Raptor 660 use the same basic 660cc five-valve single-cylinder engine. Some internal engine components (cylinder, piston, head, valvetrain) may cross between the two. However, the intake, exhaust, carburetor jetting, and engine mapping differ between the utility-tuned Grizzly and the sport-tuned Raptor. Confirm specific part numbers before assuming compatibility.
Q: What is the difference between the Grizzly 600 and Grizzly 660?
The Grizzly 600 (1998-2001) uses a 595cc 2-valve engine with a rigid rear axle and single shock. The Grizzly 660 (2002-2008) uses a 660cc 5-valve engine with independent rear suspension and dual shocks. The 660 has significantly better handling and rear wheel compliance. The two share no major components due to different engines, frames, and rear suspension designs.
Q: Are Grizzly 660 and Grizzly 700 parts compatible?
No. The Grizzly 660 (2002-2008) and Grizzly 700 (2007+) are different platforms. The 660 is carbureted with a 660cc 5-valve engine, while the 700 is fuel injected with a 686cc 4-valve engine in a different chassis. They share no significant components.
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