For XR400R 1996-2004 TRX400EX 1999-2007 Motorcycle Engine Parts STD~+150 Size 85~86.5 Piston Rings Gasket Oil Filter Motorcycle Cylinder Piston(Oversize 50)

For XR400R 1996-2004 TRX400EX 1999-2007 Motorcycle Engine Parts STD~+150 Size 85~86.5 Piston Rings Gasket Oil Filter It helps maintain consistent up-and-down movement during operation and supports the energy needed to drive internal tool function. This chainsaw part helps regulate the force transfer inside the tool by supporting compression and decompression timing. Simple installation process practical and convenient to use. Ensures longevity and wear resistance, providing reliable performance on the road.