Piston Kit Pro-Lite SeriesDesigned for all-purpose 2-stroke ridingDurability, longevity and increased horsepowerDedicated forging design for strength-to-weight optimizationExtra lightening operations for enhanced throttle responseEngineered, forged, and machined in the USAPiston is made in the USAFits Nikasil bore cylinders. '88-'90 Arctic Cat Wild Cat 650 standard bore is 78.00 mm, stroke is 68.00 mm, bore oversize is +3.00 mm and will require sleeving or replating. Displacement for '88-'90 Artic Cat Wild Cat is 701 cc. The rest of the Arctic Cat models listed, standard bore is 81.00 mm, stroke is 68.00 mm and standard bore size will not need sleeving or replating. Displacement will be 699 cc .