ProX
Piston Kits
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. ProX piston kits for sleeved cylinders are available in standard size and a wide range of over sizes. ProX pistons for plated cylinders come in standard size, A, B, C, D & over sizes. All ProX piston kits are supplied complete with piston rings, wrist pin and circlips, ready to install!
YAMAHA
2-Stroke Models
Years
Size
Piston Kit
Piston Rings
Piston Pin
Piston Clips
Small End Bearing
1981 - 26 40mm 2018 - 26 43.5mm 2002 - 26 47.5mm
PW 50 YZ 65 YZ 85 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125
+000.PX
.PX .PX .PX
.PR
.PX
.PROX
56-W938
56-R1263 56-R1280 56-R1264
56-7979
56-0165
56-7996 56-822 56-821 56-815 56-815 56-815 56-836 56-814 56-814 56-814 56-814 56-814 56-814
.A.PX
–
–
.PROX .PROX .PROX .PROX .PROX .PROX .PROX .PROX .PROX .PROX .PROX .PROX
56-W9991
.A.PX
.PR
.PX .PX .PX .PX .PX .PX .PX .PX .PX .PX .PX
56-W805 56-W503 56-W629 56-W647 56-W726 56-W726 56-W797 56-W845 56-W899 56-W845 56-W899
56-7930 56-721 56-721
56-0170 56-0176 56-0176 56-0176 56-0174 56-0174 56-0174 56-0174 56-0174 56-0174 56-0174
+000_PX ***
1983
56mm
– – –
.DR .DR .PR
1990 - 93 56mm 1994 - 96 54mm 1997 - 00 54mm
+00B.PX +00A.PX
56-726
.A.PX .A.PX .A.PX .A.PX .A.PX .A.PX .A.PX
.PX .PX .PX .PX .PX .PX .PX
.PR .PR .PR .PR .PR .PR
56-R1265 56-R1265 56-R1250 56-R1266 56-R1266 56-R1266 56-R1266
56-0714 56-0714 56-0714 56-0715 56-0715 56-0715
2001
54mm
2002 - 04 54mm 2005 - 21 54mm 2022 - 26 54mm 2020 - 22 54mm 2023 - 26 54mm
YZ 125X YZ 125X
1982 - 83 68mm 56-W9859.200.PX **
IT 175 YZ 250 YZ 250
– –
– –
–
–
1988 - 98 68mm 1999 - 26 66.4mm 2016 - 26 66.4mm 1988 - 97 68mm
.B.PX .A.PX .A.PX .B.PX
.PX .PX .PX .PX
.PROX
56-W677 56-W742 56-W742 56-W677
56-0181 56-0181 56-0181 56-0181
56-8090 56-8010 56-8010 56-8090
.PX .PX
.PR .PR
.PX .PX
56-R1259 56-R1259
56-0729 56-0729
YZ 250X WR 250
–
–
.PROX
4-Stroke Models
Years
Size
Piston Kit
Piston Rings
Piston Pin
Piston Clips
Small End Bearing
YZ 250F (Std. Comp. 12.5:1) YZ 250F (Std. Comp. 13.5:1) YZ 250F (Std. Comp. 13.5:1) YZ 250F (Std. Comp. 13.5:1) YZ 250F (Std. Comp. 13.5:1) YZ 250F (Std. Comp. 13.8:1) YZ 250FX (Std. Comp. 13.5:1) YZ 250FX (Std. Comp. 13.5:1) YZ 250FX (Std. Comp. 13.8:1) WR 250F (Std. Comp. 12.5:1) WR 250F (Std. Comp. 13.5:1) WR 250F (Std. Comp. 13.5:1) WR 250F (Std. Comp. 13.8:1) YZ 400F (Std. Comp. 12.5:1) WR 400F (Std. Comp. 12.5:1) YZ 426 F (Std. Comp. 12.5:1) WR 426 F (Std. Comp. 12.5:1) YZ 450 F (Std. Comp. 12.5:1) YZ 450 F (Std. Comp. 12.5:1) YZ 450 F (Std. Comp. 12.5:1) YZ 450 F (Std. Comp. 12.8:1) YZ 450 F (Std. Comp. 13.0:1) YZ 450 F (Std. Comp. 13.0:1) YZ 450 FX (Std. Comp. 12.5:1) YZ 450 FX (Std. Comp. 12.8:1) YZ 450 FX (Std. Comp. 13.0:1) YZ 450 FX (Std. Comp. 13.0:1) WR 450 F (Std. Comp. 12.5:1) WR 450 F (Std. Comp. 12.5:1) WR 450 F (Std. Comp. 12.8:1) WR 450 F (Std. Comp. 13.0:1) WR 450 F (Std. Comp. 13.0:1) XT 500 (Std. Comp. 9.0:1)
2001 - 07 77mm 2008 - 11 77mm 2012 - 13 77mm 2014 - 15 77mm 2016 - 18 77mm 2019 - 26 77mm 2015 - 16 77mm 2017 - 19 77mm 2020 - 26 77mm 2001 - 13 77mm 2015 - 17 77mm 2018 - 19 77mm 2020 - 26 77mm 1998 - 99 92mm 1998 - 00 92mm 2000 - 02 95mm 2001 - 02 95mm 2003 - 09 95mm 2010 - 13 97mm 2014 - 17 97mm 2018 - 19 97mm 2020 - 22 97mm 2023 - 26 97mm 2016 - 18 97mm 2019 - 20 97mm 2021 - 23 97mm 2024 - 26 97mm 2003 - 15 95mm 2016 - 18 97mm 2019 - 20 97mm 2021 - 23 97mm 2024 - 26 97mm 1976 - 81 87mm 1984 - 04 95mm
.A.PX
.PX .PX .PX .PX .PX .PX .PX .PX
.PR .PR .PR
.PX .PX
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
56-W188
56-R1208 56-R1208 56-R1208 56-R1245 56-R1245 56-R1245 56-R1245 56-R1245
56-0718 56-0718 56-7966
56-0176 56-0176
.A.PX
56-W4952
.00A.PX
.PX .PX
56-W108
56-0176 56-0176
.A.PX .A.PX .A.PX .A.PX .A.PX .A.PX
56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR
56-W4961 56-W4966 56-W8812 56-W4961 56-W4966 56-W8812
.PX .PX
56-0176 56-0176
.PX .PX
56-0176 56-0176
.PX .PX .PX .PX .PX
.PX .PX
56-R1245 56-R1208 56-R1245 56-R1245 56-R1245
56-0176 56-0176
.A.PX
.PR
56-W188
56-0718
.A.PX .A.PX .A.PX .B.PX .B.PX
56-6500.PR 56-6500.PR 56-6500.PR
.PX .PX
56-W4961 56-W4966 56-W8812 56-W4649 56-W4649 56-W4693 56-W4693
56-0176 56-0176
.PX .PX
56-0176 56-0181
– –
– –
.PX .PX
56-0181 56-0185
+00B.P +00B.P
.PX .PX .PX .PX
.PR .PR
56-R1209 56-R1209 56-R1209 56-R1267
56-0732 56-0732
.PX .PX
56-0185 56-0182
.A.PX .B.PX
56-0726.PR
56-W222 56-W261
.PR .PR
.PX .PX
56-0725 56-0725
56-0181 56-0181
.B.PX .A.PX .A.PX .A.PX .B.PX
.PX .PX .PX .PX
56-W4963 56-W4965 56-W4787 56-W4986 56-W4963 56-W4965 56-W4787 56-W4986
56-R1255 56-R1267 56-R1267 56-R1245
– –
.PX .PX
56-0181 56-0181
.PX .PX
56-0176 56-0181
.PX .PX .PX .PX .PX .PX
.PR
56-R1255 56-R1267 56-R1267 56-R1245 56-R1209 56-R1255
56-0725
.A.PROX
– –
.PX .PX
56-0181 56-0181
.A.PX .A.PX
.PX .PX
56-0176 56-0182
.A.PX
56-0726.PR
56-W222
.PX .PX
.B.PX
.PR
56-0181 56-0181
56-W4963 56-W4965 56-W4787 56-W4986 56-W4045 56-W4596
56-0725
.A.PROX
.PX .PX .PX
– –
56-R1267 56-R1267 56-R1245
.A.PX .A.PX
.PX .PX
56-0181 56-0176
+000.P .000.PX
– –
–
–
– –
XT/TT 600
.PR
.PX
56-0744
56-0191
**Only available in +2mm oversize ***Only available in oversizes
*Please visit our website for current prices
E-mail: sales@oro2u.com
www.oro2u.com
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