Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050
Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050

Wiseco 100.50 mm Yamaha YFM660 Piston Kit 4966M10050

  • Sale
  • $209.99
  • $232.95
Shipping calculated at checkout.
We have 6 ready to ship.
The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco's forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability you're looking for. 100.50 mm Bore - 9.9:1 CR
  • Improved tensile strength of forged material optimizes strength and service life
  • Designed and built for each specific 4-stroke powersports engine
  • Dedicated forgings allow for optimized strength-to-weight ratio
  • Includes high-quality piston rings, wrist pin(s), and circlips
  • Engineered, forged, and machined in the USA in Mentor, OH
  • 100.50 mm Bore, 9.9:1 CR

The Wiseco 4966M10050 forged 4-stroke piston kit is designed for specific Yamaha powersports engine applications. It features a 100.50 mm bore and a 9.9:1 compression ratio, with forged construction engineered to provide strength and service life for performance and reliability.

This piston kit fits the 2001–2005 Yamaha YFM660R Raptor, 2002–2005 Yamaha YFM660F Grizzly 4x4, and 2004 Yamaha YXR66F Rhino 660. The dedicated forging is designed to optimize the strength-to-weight ratio for the application.

The kit includes high-quality piston rings, wrist pin(s), and circlips. The piston is engineered, forged, and machined in the USA in Mentor, Ohio. Manufacturer part number: 4966M10050. Vendor part number: 4966M10050.

Features:

  • Brand: Wiseco
  • Model: Yamaha YFM660 Raptor/Grizzly/Rhino 9.91 CR Piston Kit
  • Size: 100.50 mm bore
  • Compression ratio: 9.9:1
  • Construction: Forged 4-stroke piston material designed for improved tensile strength and service life
  • Application: Designed and built for the specific Yamaha powersports engine application
  • Strength-to-weight ratio: Dedicated forging optimized for the application
  • Included components: High-quality piston rings, wrist pin(s), and circlips
  • Manufacturing: Engineered, forged, and machined in the USA in Mentor, Ohio
  • Fitment: 2001–2005 Yamaha YFM660R Raptor; 2002–2005 Yamaha YFM660F Grizzly 4x4; 2004 Yamaha YXR66F Rhino 660
  • Manufacturer part number: 4966M10050
  • Vendor part number: 4966M10050



Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: powersports
Epa: N/A
Clearance Item: t
Regular Stock: false
Units Per Sku: 1
Fitment:
2001 Yamaha YFM660R Raptor Base
2002 Yamaha YFM660F Grizzly 4x4 Base
2002 Yamaha YFM660R Raptor Base
2003 Yamaha YFM660F Grizzly 4x4 Base
2003 Yamaha YFM660R Raptor Base
2004 Yamaha YFM660F Grizzly 4x4 Base
2004 Yamaha YFM660R Raptor Base
2004 Yamaha YXR66F Rhino 660 Base
2005 Yamaha YFM660F Grizzly 4x4 Base
2005 Yamaha YFM660R Raptor Base
2005 Yamaha YXR66F Rhino 660 Base
2006 Yamaha YFM660F Grizzly 4x4 Base
2006 Yamaha YXR66F Rhino 660 Base
2006 Yamaha YXR66F Rhino 660 Exploring Edition Base
2006 Yamaha YXR66F Rhino 660 Special Edition Base
2007 Yamaha YFM660F Grizzly 4x4 Base
2007 Yamaha YXR66F Rhino 660 Base
2007 Yamaha YXR66F Rhino 660 Ducks Unlimited Base
2007 Yamaha YXR66F Rhino 660 Exploring Edition Base
2007 Yamaha YXR66F Rhino 660 Special Edition Base
2007 Yamaha YXR66F Rhino 660 Sport Edition Base
2008 Yamaha YFM660F Grizzly 4x4 Base