Yamaha Rd350 Parts WSM Piston Kit: Yamaha 350 Banshee 87 06 4mm Over Big Bore Long Rod 50 520 5 68 1991 Yamaha Warrior 350 NICHE Standard Piston Bore Size 83mm; Material: Aluminum Alloy; Surface Coating: None; Type: Flat Compatible with the following models: Big Bear 350,Bruin 350,Grizzly 350,Moto 4, Raptor 350,Warrior 350,Wolverine 350 NICHE Stock Piston Kit for Yamaha Moto Big Wheel Bruin Wolverine 350 1YW-11636-01 1YW -11638- 01 5UH- 11636 in Engine Some of the NICHE product categories include cylinders, brake pads, axles, off-road mirrors, and drive chains. NICHE PISTON An ATV piston is a component of engines, pumps, and gas compressors. The piston head is the top surface of the piston which is subjected to tremendous forces and heat during normal engine operation Compatible with: Yamaha 1995-2009 Wolverine 350, 2004-2006 Bruin 350, 2004-2013 Raptor 350, 2007-2014 Grizzly 350 The piston acts as a movable end of the combustion chamber. NICHE Piston Part Number 519-KPS2220T Includes: NICHE Piston Kit It is located in a cylinder and is made gas-tight by piston rings. Compatible with OEM Part Numbers: Yamaha 1YW-11636-01-00, 1YW-11638-01-00, 1YW-11631-01-Y0, 5UH-11631-00-C0 Compatible with OEM Part Numbers: Yamaha 5UH-11636-00-00, 5UH-11638-00-00, 1UY-11631-01-Y0, 1UY-11638-01-00, 1UY-11636-01-00 In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft through a piston rod and or connecting rod Piston Anatomy A piston is a cylindrical engine component that slides back and forth in the cylinder bore by forces produced during the combustion process. About NICHE NICHE provides Powersports replacement parts.