ORO2U Dirt Catalogue - Section E - Engine and Performance.

Cylinder Works

Cylinder Kits

Standard Cylinder Only

Standard Bore Cylinder Kit

Big Bore Cylinder Kit

HONDA Models 4-Stroke

Years Disp. Dia.

Part No.

Disp. Dia.

Part No.

Disp. Dia.

Oversize Part No.

CRF 150 R/RB CRF 150 R/RB CRF 150 R/RB CRF 150 R/RB

2007 - 09 150cc 66mm 56-K116.66.CW 2010 - 11 150cc 66mm 56-K116.66.CW 2012 - 25 150cc 66mm 56-K116.66.CW

160cc 68mm +2mm 56-K116.68.CKW1

160cc 68mm +2mm 56-K116.68.CKW2

2026

150cc 66mm 56-K116.66.CW

256cc 79mm +1mm 56-K100.79.CKW Replacement Vertex Piston Kit: 23461 Replacement Top End Gaskets: 56-K100.79.GKW 270cc 81mm +3mm 56-K100.81.K.W Replacement Vertex Piston Kit: 23535 Replacement Top End Gaskets: 56-K100.81.G.CW 270cc 80mm +3mm 56-K134.80.WORK Replacement Vertex Piston Kit: 23653 270cc 80mm +3mm 56-K134.80.WORK Replacement Vertex Piston Kit: 23653

CRF 250 R

2004 - 09 250cc 78mm 56-K100.78.C.W

CRF 250 R

2010 - 13 249cc 76mm 56-K134.768.C.W 250cc 76mm 56-K134.768.WORK

CRF 250 R

2014 - 17 249cc 76mm 56-K134.768.C.W

CRF 250 R

2018 - 19

56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK 270cc 82mm +3mm 56-K197.82_BB.CWK

CRF 250 R (High Comp. 14.6:1)

Replacement Vertex Piston Kit: 23535

2018 - 19

250cc 79mm 56-K197.79_HC.CWK

270cc 82mm +3mm 56-K197.82_BB.CWK Replacement Vertex Piston Kit: 23535

CRF 250 R

2020 - 21 250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK1

CW11011K02**

CRF 250 R CRF 250 R

2022 - 25 250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK2 270cc 82mm +3mm

2026 2025 2026

250cc 79mm 56-K197.79_STD.CW

CW11011K02**

CRF 250 RWE CRF 250 RWE CRF 250 RX

250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK2 270cc 82mm +3mm

250cc 79mm 56-K197.79_STD.CW

2019 250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK 270cc 82mm +3mm 56-K197.82_BB.CWK

CRF 250 RX (High Comp. 14.6:1)

Replacement Vertex Piston Kit: 23535

2019

250cc 79mm 56-K197.79_HC.CWK

270cc 82mm +3mm 56-K197.82_BB.CWK Replacement Vertex Piston Kit: 23535

CRF 250 RX

2020 - 21 250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79.CWK

CW11011K02**

CRF 250 RX CRF 250 RX

2022 - 25 250cc 79mm 56-K197.79_STD.CW 250cc 79mm 56-K197.79_STD.CWK2 270cc 82mm +3mm

2026

250cc 79mm 56-K197.79_STD.CW

256cc 79mm +1mm 56-K100.79.CKW Replacement Vertex Piston Kit: 23461 Replacement Top End Gaskets: 56-K100.79.GKW 270cc 81mm +3mm 56-K100.81.K.W Replacement Vertex Piston Kit: 23535 Replacement Top End Gaskets: 56-K100.81.G.CW 488cc 100mm +4mm 56-K100.100.CKW Replacement Vertex Piston Kit: 22966 480cc 99mm +3mm 56-K142.099.CKW1 Replacement Vertex Piston Kit: 23534 Replacement Top End Gaskets: 56-K142.099.GKW 480cc 99mm +3mm 56-K142.099.CKW2 Replacement Vertex Piston Kit: 23924 Replacement Top End Gaskets: 56-K142.099.GKW 480cc 99mm +3mm 56-K188.099.CKW Replacement Vertex Piston Kit: 24198

CRF 250 X

2004 - 17 250cc 78mm 56-K100.78.C.W

CRF 450 R

2002 - 08 449cc 96mm 56-K101.096.CW

CRF 450 R

2009 - 12 449cc 96mm 56-K142.096.C.W 449cc 96mm 56-K142.096.CKW

CRF 450 R

2013 - 16 449cc 96mm 56-K142.096.C.W

CRF 450 R

2017 - 18 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW

11010-K02**

480cc 99mm +3mm

CRF 450 R / RWE

2019 - 20 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW2

Replacement Vertex Piston Kit: 24198

11010-K03**

CRF 450 R / RWE CRF 450 R / RWE

2021 - 25 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW3

480cc 99mm +3mm

2026

450cc 96mm 56-K188.096.CYW

480cc 99mm +3mm 56-K188.099.CKW Replacement Vertex Piston Kit: 24198

CRF 450 RX

2017 - 18 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW

11010-K02**

480cc 99mm +3mm

CRF 450 RX

2019 - 20 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW2

Replacement Vertex Piston Kit: 24198

11010-K03**

CRF 450 RX CRF 450 RX

2021 - 25 450cc 96mm 56-K188.096.CYW 450cc 96mm 56-K188.096.CKW3

480cc 99mm +3mm

2026

450cc 96mm 56-K188.096.CYW

480cc 99mm +3mm 56-K115.099.CKW Replacement Vertex Piston Kit: 23595

CRF 450 X

2005 - 17 449cc 96mm 56-K115.096.CW

**Please note these items are By Order Only

*Please visit our website for current prices E105

E-mail: sales@oro2u.com

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