-- Made of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance \n-- The smooth profile ensures a regular flow and the perfect flame propagation \n-- The pistons for 4-stroke Off-Road motorcycles are made by reverse extrusion and produced numerical control (CNC) machines \n-- Piston rings create less friction with the cylinder and therefore a higher performance. The segments included, Made in Japan, have a wear-resistant coatings (PVD or chromium nitride) to increase the retain and the durabilityBrandATHENABore Size78,95 mmEngine Type4-StrokeTypeTop EndCompression Ratio Imperial14.1:1Product NamePiston KitPiston MaterialForged, Aluminum AlloyVendor part numberP5F0790323002ACompression Ratio14,1:1Displacement250 cc\n\nAbout Us\n\nQuad Bikes Wales Is The UK's Largest Utility ATV Parts & Accessories Supplier And We Are Based In Pontardawe Near Swan.