Prox Piston Kit Rm-z250 `07-09 13.4:1 (76.98mm)

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 Bore - Actual 77.00 mm Bore - Standard 77.00 mm Boss Space In 18.40 mm Compression Height 11.70 mm Compression Ratio - Actual 13.4:1 Country of Origin Japan OEM Reference No 12111-10H20-0F0 Piston Head Type Dome Piston Pin Hole Diameter 16.00 mm Piston Size 76.98 mm Skirt Coating - Total Height 35.95 mm