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Pro-X Racing Forged Piston Kit for 1988-98 Yamaha YZ250 / WR250F - 67.97mm - 01.2314.D 2011 Yamaha YFZ450X 2014 Polaris RZR 800 SPro X Racing Parts Piston Kit ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low expansion, low friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV, Personal Watercraft, etc. Our OEM style Tin coated pistons assist the wear in process when you just started the