Wiseco forged pistons are superior in strength and design
Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls
Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse
Kit includes forged pistons, rings, circlips, wrist pins and top end gasket set
NOTE: This will also fit on Polaris Pro XR 440 2004 model
Our pistons, rings and kits are sold by application and bore size. Please note that STANDARD and OVERSIZES are not indicated. To get the correct part, you must know the standard bore size to make sure you are ordering either the standard or correct amount of oversize that you need. If you have any questions, please call Technical Service.