Athena 2018 Yamaha WR 250 F 76.95mm Bore Forged 4-Stroke Top End Piston Kit w/Top End Gasket

The Athena P5F0770187009A Piston Kit is made of high-performance aluminum alloy with high silicon content, designed for 4-stroke Off-Road motorcycles. It features a smooth profile for regular flow and perfect flame propagation, and is produced using reverse extrusion and CNC machines. The piston rings are made in Japan with wear-resistant coatings (PVD or chromium nitride) to create less friction with the cylinder. This kit has a compression ratio of 13.5:1 and a bore size of 76.95 mm for 250cc displacement engines. While fitment for 2016-2018 Yamaha YZ 250 F and 2018 Yamaha WR 250 F was identified through research, it could not be validated against the vehicle database due to connection issues.