Prox Piston Kit Xr400r `96-04 + Trx400ex/x `99-14 (85.25mm)

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. Coated for ultimate performance Most of the ProX pistons come with a coating. Our OEM style Tin coated pistons assist the wear in process when you just started the bike. We have developed a new skirt coating that not only assists the wear in process, but also helps reducing friction after the wear in. The black coating is made from a delicate mix of materials and will increase performance.   Product specifications Attribute Value Additional Info 4 Valve Pockets, Cast Piston Bore - Actual 85.25 mm Bore - Oversize 0.25 mm Bore - Standard 85.00 mm Boss Space In 20.00 mm Compression Height 16.00 mm Country of Origin Japan OEM Reference No 13101-KCY-670 Piston Head Type Flat Piston Pin Hole Diameter 20.00 mm Skirt Coating - Text on Piston MADE IN JAPAN / PROX / HM1400 '96 Total Height 53.00 mm