ORO2U Dirt Catalogue - Section E - Engine and Performance.

Cylinder Kits

Cylinder Works

Standard Cylinder Only

Standard Bore Cylinder Kit

Big Bore Cylinder Kit

YAMAHA

Models 4-Stroke

Years cc.

Dia.

Part No.

cc.

Dia.

Part No.

cc.

Dia.

Oversize Part No.

270 80mm +3mm Uses Vertex Piston Kit: 23925 270 80mm +3mm Uses Vertex Piston Kit: 23925 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm 270 80mm +3mm Uses Vertex Piston Kit: 23129 270 80mm +3mm Uses Vertex Piston Kit: 23129 270 80mm +3mm Uses Vertex Piston Kit: 23129 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm Uses Vertex Piston Kit: 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm Uses Vertex Piston Kit: 23943 270 80mm +3mm Uses Vertex Piston Kit: 480 98mm +3mm Uses Vertex Piston Kit: 23404 480 98mm +3mm Uses Vertex Piston Kit: 23404 470 99mm +2mm Uses Vertex Piston Kit: 23655 470 99mm +2mm Uses Vertex Piston Kit: 24369 470 99mm +2mm Uses Vertex Piston Kit: 24461 480 98mm +3mm Uses Vertex Piston Kit: 23404 480 98mm +3mm Uses Vertex Piston Kit: 23404 470 99mm +2mm Uses Vertex Piston Kit: 23655 470 99mm +2mm Uses Vertex Piston Kit: 23655 470 99mm +2mm Uses Vertex Piston Kit: 24369 470 99mm +2mm Uses Vertex Piston Kit: 24461 470 99mm +2mm Uses Vertex Piston Kit: 24369 470 99mm +2mm Uses Vertex Piston Kit: 24461

.80.CKW

56-K103

20002-K01**

WR 250F

2001 - 04 250 77mm

.77.CW 250 77mm

56-K103

.80.CKW

56-K103

20002-K02**

WR 250F

2005 - 13 250 77mm

.77.CW 250 77mm

56-K103

.80.CKW

56-K170

20010-K01**

WR 250F

2015 - 17 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K170

20010-K02**

WR 250F

2018 - 19 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K250

WR 250F

2020 - 24 250 77mm

.77.CYW 250 77mm

.77.CKW

56-K250

2025 - 26

WR 250F

250 77mm

.77.CYW

56-K250

.80.CKW

56-K103

20002-K01**

YZ 250F

2001 - 04 250 77mm

.77.CW 250 77mm

56-K103

.80.CKW

56-K103

20002-K02**

YZ 250F

2005 - 07 250 77mm

.77.CW 250 77mm

56-K103

.80.CKW

56-K103

20002-K03**

YZ 250F

2008 - 13 250 77mm

.77.CW 250 77mm

56-K103

.80.CKW

56-K170

20010-K01**

YZ 250F

2014 - 15 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K170

20010-K02**

YZ 250F

2016 - 18 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K250

YZ 250F

2019 - 24 250 77mm

.77.CYW 250 77mm

.77.CKW

56-K250

2025 - 26

YZ 250F

250 77mm

.77.CYW

56-K250

.80.CKW

56-K170

20010-K01**

YZ 250FX

2015 - 16 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K170

20010-K02**

YZ 250FX

2017 - 19 250 77mm

.77.CW 250 77mm

56-K170

.80.CKW

56-K250

YZ 250FX

2020 - 24 250 77mm

.77.CYW 250 77mm

.77.CKW

56-K250

2025 - 26

YZ 250FX

250 77mm

.77.CYW

56-K250

.98.CKW

56-K114

20001-K02**

WR 450F

2003 - 06 450 95mm

.95.CW 450 95mm

56-K114

.98.CKW

56-K108

20003-K01**

WR 450F

2007 - 15 450 95mm

.95.CW 450 95mm

56-K108

.099.CKW

56-K165

20005-K02**

WR 450F

2016 - 18 450 97mm

.097.CW 450 97mm

56-K165

.99.CKW

56-K198

WR 450F

2019 - 20 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K198

.99.CKW

56-K251

WR 450F

2021 - 23 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K251

.98.CKW

56-K114

20001-K02**

YZ 450F

2003 - 05 450 95mm

.95.CW 450 95mm

56-K114

.98.CKW

56-K108

20003-K01**

YZ 450F

2006 - 09 450 95mm

.95.CW 450 95mm

56-K108

.099.CKW

56-K138

20005-K01**

YZ 450F

2010 - 13 450 97mm

.097.CW 450 97mm

56-K165

.099.CKW

56-K165

20005-K02**

YZ 450F

2014 - 17 450 97mm

.097.CW 450 97mm

56-K165

.99.CKW

56-K198

YZ 450F

2018 - 19 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K198

.99.CKW

56-K251

YZ 450F

2020 - 22 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K251

.99.CKW

56-K198

YZ 450FX

2019 - 20 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K198

.99.CKW

56-K251

YZ 450FX

2021 - 23 450 97mm

.97.CYW 450 97mm

.97.CKW

56-K251

**Please note these items are By Order Only

*Please visit our website for current prices E110

www.oro2u.com

Tel: 01597 822 666

Fax: 01597 825 224

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