Yamaha Raptor 660 YFM660R Top End Rebuild Kit Nikasil Cylinder Piston Gasket Kit

Unlock the full power of your Yamaha 660 with this top-of-the-line Big Bore Top End Kit.

Squeeze every last ounce of power from your Yamaha 660 with this premium top end kit. The large 102mm +2mm bore size and high 11:1 compression ratio deliver a serious boost in horsepower and torque, while the Nikasil-plated cylinder walls provide unmatched heat transfer and wear resistance. This kit is engineered to handle the demands of high-performance riding, ensuring your Yamaha 660 can tackle the toughest terrain with confidence.

Fits Yamaha Raptor 660 / Rhino 660 / Grizzly 660 - All Years and Models

Drop In Ready. No case modification required.

Key Features:

• BPRATV 102mm +2mm big bore cylinder with Nikasil plating for increased lubricity and reduced friction
• Nikasil plating dissipates heat more effectively for a cooler-running engine
• Nikasil is harder than steel for long-lasting durability and performance
• Lightweight design is much more cost-effective than a traditional steel-sleeved cylinder
• Can be re-plated repeatedly without boring or re-sleeving

Kit Includes:

• BPRATV 102mm +2mm Big Bore Cylinder with Nickel / Carbide (Nikasil Plated) Plating
• Wiseco 102mm 11:1 forged piston kit (includes piston rings, wristpin, and circlips)
• Cometic Top End Gasket Kit with 102mm Big Bore MLS Head Gasket
• Kibblewhite Precision Hi-Temp Red Viton Valve Stems Seals (All 5)

The Nikasil plating on this big bore cylinder kit delivers unparalleled performance and longevity. The ultra-smooth, low-friction surface allows your Yamaha YFM660 to run more efficiently, with less heat buildup for improved reliability. And because the Nikasil can be re-plated over and over, you'll enjoy the benefits of this top end upgrade for years to come without the need for costly cylinder work.