Wiseco 4966M10000 100.00mm 9.9:1 Compression 660cc ATV Piston Kit, Silver

Wiseco Piston Kit Wiseco leads the performance aftermarket by producing the highest quality forged pistons for Dirt Bikes, ATV's, Snowmobiles, Outboard Marine and Motorcycles in the. Wiseco is unique because all of the pistons are forged in house. All of the forge tooling is also produced in the USA. All aspects of the manufacturing process is controlled, from the raw bar to skirt coating finished parts. Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.

Fits the Following:

Yamaha YFM660F Grizzly (2002 - 2008)
Yamaha YXR660 Rhino (2004 - 2007)
Yamaha YXR660 Rhino (2005 - 2007)
Yamaha YFM660R Raptor (2001 - 2005)
Bullets change to:
1 millimeter
Single Piston Kit ( includes 3937XS - 100.00 mm Ring Set, CW22 - ROUND WIRE PIN LOCKS 22MM (PAIR), S655 - PistonPin 22 x 57.15mm NonChromed SW )
Forged
High compression