ORO2U Dirt Catalogue - Section E - Engine and Performance.

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 56-R1263.PX 56-R1280.PX 56-R1264.PX

Piston Pin 56-7979.PR

Piston Clips 56-0165.PX

Small End Bearing

1981 - 25 40mm

PW 50 YZ 65 YZ 85 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125 YZ 125

56-W938+000.PX

56-7996.PROX 56-822.PROX 56-821.PROX 56-815.PROX 56-815.PROX 56-815.PROX 56-836.PROX 56-814.PROX 56-814.PROX 56-814.PROX 56-814.PROX 56-814.PROX 56-814.PROX

2018 - 25 43.5mm 56-W9991.A.PX 2002 - 25 47.5mm 56-W805.A.PX

56-7930.PR 56-721.DR 56-721.DR 56-726.PR 56-0714.PR 56-0714.PR 56-0714.PR 56-0715.PR 56-0715.PR 56-0715.PR

56-0170.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0174.PX 56-0174.PX 56-0174.PX 56-0174.PX 56-0174.PX 56-0174.PX 56-0174.PX

56-W503+000_PX *** 56-W629+00B.PX 56-W647+00A.PX

1983

56mm

– – –

1990 - 93 56mm 1994 - 96 54mm

1997 - 00 54mm 56-W726.A.PX

56-R1265.PX 56-R1265.PX 56-R1250.PX 56-R1266.PX 56-R1266.PX 56-R1266.PX 56-R1266.PX

2001

54mm 56-W726.A.PX

2002 - 04 54mm 56-W797.A.PX 2005 - 21 54mm 56-W845.A.PX 2022 - 25 54mm 56-W899.A.PX 2020 - 22 54mm 56-W845.A.PX 2023 - 25 54mm 56-W899.A.PX 1982 - 83 68mm 56-W9859.200.PX ** 1988 - 98 68mm 56-W677.B.PX 1999 - 25 66.4mm 56-W742.A.PX 2016 - 25 66.4mm 56-W742.A.PX 1988 - 97 68mm 56-W677.B.PX

YZ 125X YZ 125X

IT 175 YZ 250 YZ 250

– –

– –

56-0181.PX 56-0181.PX 56-0181.PX 56-0181.PX Piston Clips 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0176.PX 56-0181.PX 56-0181.PX 56-0185.PX 56-0185.PX 56-0182.PX 56-0182.PX 56-0181.PX 56-0181.PX 56-0181.PX 56-0181.PX 56-0176.PX 56-0181.PX 56-0181.PX 56-0181.PX 56-0176.PX 56-0182.PX 56-0182.PX 56-0181.PX 56-0181.PX 56-0181.PX 56-0176.PX

56-8090.PROX

56-R1259.PX 56-R1259.PX

56-0729.PR 56-0729.PR

56-8010.PX 56-8010.PX

YZ 250X WR 250

56-8090.PROX

4-Stroke Models

Years

Size

Piston Kit

Piston Rings 56-R1208.PX 56-R1208.PX 56-R1208.PX 56-R1245.PX 56-R1245.PX 56-R1245.PX 56-R1245.PX 56-R1245.PX 56-R1245.PX 56-R1208.PX 56-R1245.PX 56-R1245.PX 56-R1245.PX

Piston Pin 56-0718.PR 56-0718.PR 56-7966.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-6500.PR 56-0718.PR 56-6500.PR 56-6500.PR 56-6500.PR

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)

2001 - 07 77mm 56-W188.A.PX 2008 - 11 77mm 56-W4952.A.PX 2012 - 13 77mm 56-W108.00A.PX 2014 - 15 77mm 56-W4961.A.PX 2016 - 18 77mm 56-W4966.A.PX 2019 - 25 77mm 56-W8812.A.PX 2015 - 16 77mm 56-W4961.A.PX 2017 - 19 77mm 56-W4966.A.PX 2020 - 25 77mm 56-W8812.A.PX 2001 - 13 77mm 56-W188.A.PX 2015 - 17 77mm 56-W4961.A.PX 2018 - 19 77mm 56-W4966.A.PX 2020 - 25 77mm 56-W8812.A.PX 1998 - 99 92mm 56-W4649.B.PX 1998 - 00 92mm 56-W4649.B.PX

– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

– –

– –

2000 - 02 95mm 2001 - 02 95mm

56-W4693+00B.P 56-W4693+00B.P

56-R1209.PX 56-R1209.PX 56-R1209.PX 56-R1209.PX 56-R1267.PX 56-R1255.PX 56-R1267.PX 56-R1267.PX 56-R1245.PX 56-R1255.PX 56-R1267.PX 56-R1267.PX 56-R1245.PX 56-R1209.PX 56-R1209.PX 56-R1255.PX 56-R1267.PX 56-R1267.PX 56-R1245.PX

56-0732.PR 56-0732.PR 56-0726.PR 56-0726.PR 56-0725.PR 56-0725.PR

2003 - 09 95mm 56-W222.A.PX 2003 - 09 95mm 56-W223.B.PX 2010 - 13 97mm 56-W261.B.PX 2014 - 17 97mm 56-W4963.B.PX 2018 - 19 97mm 56-W4965.A.PX 2020 - 22 97mm 56-W4787.A.PX 2023 - 25 97mm 56-W4986.A.PX 2016 - 18 97mm 56-W4963.B.PX

(High Comp. 13.0:1)

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)

– –

56-0725.PR

2019 - 20 97mm

56-W4965.A.PROX

– –

2021 - 23 97mm 56-W4787.A.PX 2024 - 25 97mm 56-W4986.A.PX 2003 - 15 95mm 56-W222.A.PX 2003 - 15 95mm 56-W223.B.PX 2016 - 18 97mm 56-W4963.B.PX

56-0726.PR 56-0726.PR 56-0725.PR

(High Comp. 13.0:1)

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)

2019 - 20 97mm

56-W4965.A.PROX

– –

2021 - 23 97mm 56-W4787.A.PX 2024 - 25 97mm 56-W4986.A.PX

1976 - 81 87mm

56-W4045+000.P

– –

– –

XT/TT 600

1984 - 04 95mm 56-W4596.000.PX

56-0744.PR

56-0191.PX

**Only available in +2mm oversize ***Only available in oversizes

*Please visit our website for current prices

E-mail: sales@oro2u.com

www.oro2u.com

E7b

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