2000-2008 Yamaha YFM Big Bear 400 ATV Engine Piston Kit [Bore Size (mm): 83.5]

Namura Piston Kit

All Namura Pistons have Molybdenium/Teflon Coatings that Minimize Resistance and Wear to Provide Extended Life

Anodized Domes That Provie Superior Heat Resistance and Extended Life Span

Super-High Silicone Content for Additional Strength

Premium World Class Rings Produced by the Largest Japanese OEM Supplier in the World

MOS(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 horse power 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