Pro X 2-Stroke Piston

• Product Details

  Important note: This piston is for a stock or oversized bore. Please measure your cylinder to check clearance before ordering.

  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 and European engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your machine.

  Most ProX pistons come with a coating. The O.E.M. style tin-coated pistons assist the wear-in process as when you first started the bike. ProX has 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.

  • Cast piston puts engine back to standard specs without boring or replacing cylinder.
  • The stock sized pistons interchange directly with O.E.M. part.
  • Piston kit comes complete with piston, rings, pin and end clips.

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• Pro X 2-Stroke Piston Review

• 25 Questions about the Pro X 2-Stroke Piston

• Fitment

• # Part Numbers for the Pro X 2-Stroke Piston

  Product Variant	Manufacturer Part #
  .010" Oversize	01.2020.025
  .020" Oversize	01.2020.050
  .030" Oversize	01.2020.075
  .040" Oversize	01.2020.100
  .050" Oversize	01.2020.125
  .060" Oversize	01.2020.150
  .070" Oversize	01.2020.175
  .080" Oversize	01.2020.200
  .090" Oversize	01.2020.225
  .100" Oversize	01.2020.250
  A Piston / 53.95mm	01.2232.A
  B Piston / 53.96mm	01.2232.B
  C Piston / 53.97mm	01.2232.C
  Oversized / 40.5mm / +.50mm	01.2005.050
  Oversized / 41mm / +1.00mm	01.2005.100
  Oversized / 47.5mm / +.50mm	01.2008.050
  Oversized / 48mm / +1.00mm	01.2008.100
  Oversized / 49mm / +1.50mm	01.3111.150
  Oversized / 50.5mm / +.50mm	01.3180.050
  Oversized / 51.5mm / +1.50mm	01.3180.150
  Oversized / 51mm / +1.00mm	01.3180.100
  Oversized / 66.25mm / +.25mm	01.2281.025
  Oversized / 66.5mm / +.50mm	01.1300.050, 01.1309.050, 01.2281.050, 01.4286.050
  Oversized / 66.75mm / +.75mm	01.2281.075
  Oversized / 67.25mm / +1.25mm	01.2281.125
  Oversized / 67.5mm / +1.50mm	01.1300.150, 01.1309.150, 01.2281.150, 01.4286.150
  Oversized / 67.75mm / +1.75mm	01.2281.175
  Oversized / 67mm / +1.00mm	01.1300.100, 01.1309.100, 01.2281.100, 01.4286.100
  Oversized / 68mm / +2.00mm	01.1300.200, 01.1309.200, 01.2281.200, 01.4286.200
  Oversized / 89.25mm / +.25mm	01.1408.025
  Oversized / 89.5mm / +.50mm	01.1408.050
  Oversized / 89.75mm / +.75mm	01.1408.075
  Oversized / 90.25mm / +1.25mm	01.1408.125
  Oversized / 90.5mm / +1.50mm	01.1408.150
  Oversized / 90mm / +1.00mm	01.1408.100
  Oversized / 91mm / +2.00mm	01.1408.200
  Stock	01.1111.B, 01.1113.B-CL77, 01.1208.A2, 01.1218.A2, 01.1225.B, 01.1315.A1, 01.1320.A1, 01.1323.B, 01.1325.A1, 01.1408.000, 01.4100.B, 01.4022.B, 01.4108.B, 01.4216.B, 01.4221.B, 01.4223.B, 01.4285.B, 01.4322.B, 01.4325.B, 01.4408.B, 01.6012.B, 01.6022.B, 01.6029.B, 01.6219.B, 01.6226.B, 01.6220.B, 01.6228.B, 01.6322.B, 01.6343.B, 01.6394.B, 01.3111.000, 01.3122.B, 01.3214.B, 01.3220.B, 01.3224.B, 01.3310.B, 01.3320.B, 01.2109.B-CL77, 01.2114.B, 01.2211.B, 01.2215.B, 01.2217.B, 01.2224.B, 01.2225.B, 01.2314.B, 01.2321.B, 01.1309.000, 01.1300.000, 01.3180.000, 01.2281.000, 01.3001.000
  Stock Bore / 39.46mm / A	01.6012.A, 01.6019.A
  Stock Bore / 39.47mm / B	01.6019.B
  Stock Bore / 39.48mm / C	01.6012.C, 01.6019.C
  Stock Bore / 40mm	01.2005.000
  Stock Bore / 42.95mm / A	01.4100.A
  Stock Bore / 43.44mm / A	01.2018.A
  Stock Bore / 43.45mm / B	01.2018.B
  Stock Bore / 43.46mm / C	01.2018.C
  Stock Bore / 44.45mm / A	01.4022.A
  Stock Bore / 44.47mm / C	01.4022.C
  Stock Bore / 44.48mm / D	01.4022.D
  Stock Bore / 44.96mm / A	01.6022.A, 01.6029.A
  Stock Bore / 44.98mm / C	01.6022.C, 01.6029.C
  Stock Bore / 44.99mm / D	01.6029.D
  Stock Bore / 45.94mm / B	01.2107.B
  Stock Bore / 45.95mm / B	01.1110.B
  Stock Bore / 45.95mm / C	01.2107.C
  Stock Bore / 45.96mm / C	01.1110.C
  Stock Bore / 45.96mm / D	01.2107.D
  Stock Bore / 46.95mm / A	01.4118.A, 01.6105.A
  Stock Bore / 46.95mm / C	01.2109.C
  Stock Bore / 46.96mm / B	01.6105.B, 01.4118.B
  Stock Bore / 46.96mm / C	01.1111.C
  Stock Bore / 46.96mm / D	01.2109.D
  Stock Bore / 46.97mm / C	01.4118.C, 01.6105.C
  Stock Bore / 46.98mm / D	01.4118.D, 01.6105.D
  Stock Bore / 47.44mm / A	01.2114.A
  Stock Bore / 47.46mm / C	01.1113.C, 01.2114.C
  Stock Bore / 47.94mm / A	01.3122.A, 01.4108.A
  Stock Bore / 47.96mm / C	01.3122.C, 01.4108.C
  Stock Bore / 47.97mm / D	01.4108.D
  Stock Bore / 47mm	01.2008.000
  Stock Bore / 48.45mm / A	01.4121.A, 01.4124.A
  Stock Bore / 48.46mm / B	01.4121.B, 01.4124.B
  Stock Bore / 48.47mm / C	01.4121.C, 01.4124.C
  Stock Bore / 52.45mm / A	01.4194.A, 01.4195.A
  Stock Bore / 52.46mm / B	01.4194.B, 01.4195.B
  Stock Bore / 52.47mm / C	01.4194.C, 01.4195.C
  Stock Bore / 53.93mm / A	01.1208.A
  Stock Bore / 53.94mm / A	01.1208.A1, 01.1218.A1, 01.1222.A, 01.1225.A, 01.2215.A, 01.2224.A, 01.3214.A, 01.3220.A, 01.6216.A, 01.6220.A, 01.6226.A
  Stock Bore / 53.95mm / A	01.2217.A, 01.2225.A, 01.3224.A, 01.4216.A, 01.4223.A
  Stock Bore / 53.95mm / B	01.1222.B, 01.4213.B, 01.6216.B
  Stock Bore / 53.96mm / A	01.4218.A, 01.4221.A
  Stock Bore / 53.96mm / C	01.1208.A3, 01.1218.A3, 01.1222.C, 01.1225.C, 01.2215.C, 01.2224.C, 01.3214.C, 01.3220.C, 01.4210.C, 01.4213.C, 01.6216.C, 01.6220.C, 01.6226.C
  Stock Bore / 53.97mm / C	01.2217.C, 01.2225.C, 01.3224.C, 01.4216.C, 01.4223.C
  Stock Bore / 53.97mm / D	01.1218.A4, 01.1222.D, 01.1225.D, 01.2224.D, 01.3214.D, 01.3220.D, 01.4210.D, 01.4213.D, 01.6216.D, 01.6220.D, 01.6226.D
  Stock Bore / 53.98mm / C	01.4218.C
  Stock Bore / 53.98mm / D	01.2217.D, 01.2225.D, 01.4216.D
  Stock Bore / 53.99mm / D	01.4218.D
  Stock Bore / 54.19mm / A	01.6219.A
  Stock Bore / 54.21mm / C	01.6219.C
  Stock Bore / 54.22mm / D	01.6219.D
  Stock Bore / 55.94mm / A	01.6228.A
  Stock Bore / 55.96mm / C	01.6228.C
  Stock Bore / 55.97mm / D	01.6228.D
  Stock Bore / 55.98mm / E	01.6228.E
  Stock Bore / 57.94mm / A	01.6237.A, 01.6241.A
  Stock Bore / 57.95mm / B	01.6237.B, 01.6241.B
  Stock Bore / 57.96mm / C	01.6237.C, 01.6241.C
  Stock Bore / 63.94mm / A	01.6249.A
  Stock Bore / 63.95mm / B	01.6249.B
  Stock Bore / 63.96mm / C	01.6249.C
  Stock Bore / 63.97mm / D	01.6249.D
  Stock Bore / 65.94mm / A	01.4285.A
  Stock Bore / 65.96mm / C	01.4285.C
  Stock Bore / 65.97mm / D	01.4285.D
  Stock Bore / 66.33mm / A	01.7307.A
  Stock Bore / 66.34mm / A	01.1315.A-CL77, 01.1320.A, 01.1323.A, 01.1325.A, 01.3320.A, 01.6319.A, 01.6322.A, 01.6343.A, 01.7313.A
  Stock Bore / 66.34mm / B	01.7307.B
  Stock Bore / 66.35mm / A	01.2321.A, 01.7337.A
  Stock Bore / 66.35mm / B	01.6319.B, 01.7313.B, 01.7337.B
  Stock Bore / 66.35mm / C	01.7307.C
  Stock Bore / 66.36mm / B	01.1315.A2, 01.1320.A2, 01.1325.A2
  Stock Bore / 66.36mm / C	01.3320.C, 01.4322.C, 01.4325.C, 01.6319.C, 01.6322.C, 01.6343.C, 01.7313.C, 01.7337.C
  Stock Bore / 66.37mm / B	01.1315.A3
  Stock Bore / 66.37mm / C	01.1320.A3, 01.1325.A3, 01.2321.C
  Stock Bore / 66.37mm / D	01.1323.D, 01.4322.D, 01.4325.D, 01.6343.D
  Stock Bore / 66.38mm / D	01.1315.A4, 01.2321.D
  Stock Bore / 66.94mm / A	01.3311.B
  Stock Bore / 66.95mm / C	01.3310.C, 01.3311.C
  Stock Bore / 66.96mm / D	01.3310.D, 01.3311.D
  Stock Bore / 66.97mm / E	01.3310.E
  Stock Bore / 67.36mm / C	01.4306.C
  Stock Bore / 67.37mm / D	01.4306.D-CL77
  Stock Bore / 67.44mm / A	01.6317.A
  Stock Bore / 67.45mm / B	01.6317.B
  Stock Bore / 67.46mm / C	01.6317.C
  Stock Bore / 71.94mm / A	01.6387.A, 01.6388.A, 01.6394.A-CL77, 01.6396.A, 01.7300.A, 01.7346.A, 01.7393.A, 01.7398.A
  Stock Bore / 71.95mm / B	01.6387.B, 01.6388.B, 01.6396.B, 01.7300.B, 01.7346.B, 01.7393.B, 01.7398.B
  Stock Bore / 71.96mm / C	01.6387.C, 01.6388.C, 01.6394.C, 01.6396.C, 01.7300.C, 01.7346.C, 01.7393.C, 01.7398.C
  Stock Bore / 77.94mm / A	01.6397.A
  Stock Bore / 77.95mm / B	01.6397.B
  Stock Bore / 77.96mm / C	01.6397.C
  Stock Bore / 78.95mm / A / 13.6:1	01.6341.A
  Stock Bore / 78.96mm / B / 13.6:1	01.6341.B
  Stock Bore / 78.97mm / C / 13.6:1	01.6341.C
  Stock Bore / 85.94mm / A	01.4408.A

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