Prox Kolbenkit Yz125 `97-01 (53.95mm)

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 Intake Hole, 2 Lub. Holes Exh. Skirt, Cast Piston Bore - Actual 54.00 mm Bore - Oversize STD Bore - Standard 54.00 mm Boss Space In 18.20 mm Compression Height 20.50 mm Country of Origin Japan OEM Reference No 4XM-11631-30-A0 Piston Head Type Dome Piston Pin Hole Diameter 15.00 mm Piston Size 53.95 mm Ring Locating Pin (E) 13.00 mm Skirt Coating Mos2 Skirt Coating Total Height 60.30 mm