Namura Piston Kit

For a Yamaha  YFM660 GRIZZLY 2002-2008, Rhino 660 Auto 2004-2007, YFM660R RAPTOR 2001-2005 

Namura Part Number (NA-40004-4) 100.97mm 

Stock Compression

(New) Namura Piston, Ring(s), Wrist Pin & clips for a YFM660 GRIZZLY 2002-2008, Rhino 660 Auto 2004-2007, YFM660R RAPTOR 2001-2005 

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 - Higher silicon content for reduced expansion rates and additional wear resistance, also withstanding higher cylinder temperatures.

We offer Dirt Bike parts for Honda, Kawasaki, KTM, Suzuki, Yamaha and more! 


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** Please note: Not all items can be kept in stock, and due to this handling times can be up to 5 business days.
Therefore, If you need a item in a hurry please contact us on its availability before placing your order.

** Should you purchase an item and it becomes back ordered we will give you the option to wait on its restocking or a refund will be given after 5 business days.

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MrMotocross_Parts