Namura Technologies NA-40015-4K Engine Piston Ring

Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket kit
MOS2 (Teflon/Molybdenum) Coated Skirts A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures
Machined Smooth Heads Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%
Anodized Domes Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistons
Hypereutectic Casting Process Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures

Bore: 71.95mm
Sizing: 1.00mm Oversize
Compression: 8.7:1 Compression

This item fits the following applications:
2007-2009 Yamaha YFM250 Big Bear
2005-2006 Yamaha YFM250 Bruin
1999-2004 Yamaha YFM250 Bear Tracker
1994-2000 Yamaha YFB250FW Timberwolf 4x4
1992-1998 Yamaha YFB250 Timberwolf 2x4