ORO2U Dirt Catalogue - Section E - Engine and Performance.

Cylinder Kits

Cylinder Works

Cylinder Works Cylinder Kits An alternative to costly OEM cylinders or the time consuming process of re-plating existing cylinders, Cylinder Works offers enthusiasts access to a complete line of OEM quality dirt bike and ATV replacement cylinders and cylinder kits. In addition to standard bore, stock compression replacement cylinder kits. Each kit comes complete with the piston, rings, and gaskets to get back on the track or trail quickly. The quality of a cylinder is only as good as the manufacturing. Each Cylinder Works cylinder is designed, machined, inspected for quality and matched to its components right at out home facility in Urbandale, Iowa. Cylinder Works OEM Replacement Cylinders & Cylinder Kits Each Cylinder Works replacement cylinder is: Stock in appearance, Precision honed, Nickel silicon carbide plated, OEM quality without the OEM price. Cylinder Works replacement cylinder kits also contain: Gaskets and seals needed for installation, Hand fitted, premium-quality Vertex piston kit complete with piston rings, pin and circlips.

Standard Cylinder Only

Standard Bore Cylinder Kit

Big Bore Cylinder Kit

KTM Models 4-Stroke

Years cc.

Dia.

Part No.

cc.

Dia.

Part No.

cc.

Dia.

Part No.

51002-K01**

276 80mm +4mm Uses Vertex Piston Kit: 23274

250 EXC-F

2007

249 76mm

.76.CW

56-K128

CW50015** CW50015**

CW50015K01** CW50015K01**

250 EXC-F

2024 - 25 250 81mm 2024 - 25 250 81mm

250 81mm 250 81mm

250 EXC-F Six Days

51002-K01**

276 80mm +4mm Uses Vertex Piston Kit: 23274 270 81mm +3mm Uses Vertex Piston Kit: 23867 270 81mm +3mm Uses Vertex Piston Kit: 24142

50002-K01**

250 SX-F

2005 - 12 249 76mm

.76.CW 249 76mm

56-K128

.81.CKW

56-K190

50004-K01**

250 SX-F

2013 - 15 249 78mm

.78.CW 250 78mm

56-K190

.81.CKW

56-K178

50006-K01**

250 SX-F

2016 - 22 250 78mm

.78.CW 250 78mm

56-K178

CW50015** CW50015**

CW50015K01** CW50015K01**

250 SX-F

2023 - 25 250 81mm

250 81mm 250 81mm

250 SX-F Adamo Edition

2025

250 81mm

270 81mm +3mm Uses Vertex Piston Kit: 24142

.81.CKW

56-K178

50006-K01**

250 SX-F Factory

2015 - 17 250 78mm

.78.CW 250 78mm

56-K178

CW50015** CW50015** CW50015**

CW50015K01** CW50015K01**

250 SX-F Factory 250 SX-F Factory 250 SX-F Factory

2022 2024 2025

250 81mm 250 81mm 250 81mm

250 81mm 250 81mm

250 SXS-F

2006 - 08 249 76mm

.76.CW

56-K128

51002-K01**

276 80mm +4mm Uses Vertex Piston Kit: 23274 270 81mm +3mm Uses Vertex Piston Kit: 23867 270 81mm +3mm Uses Vertex Piston Kit: 24142 365 90mm +2mm Uses Vertex Piston Kit: 23656 366 90mm +2mm Uses Vertex Piston Kit: 23656 366 90mm +2mm Uses Vertex Piston Kit: 24238 366 90mm +2mm Uses Vertex Piston Kit: 24238 366 90mm +2mm Uses Vertex Piston Kit: 24238

50002-K01**

250 XC-F

2006 - 12 249 76mm

.76.CW 249 76mm

56-K128

.81.CKW

56-K190

50004-K01**

250 XC-F

2013 - 15 249 78mm

.78.CW 250 78mm

56-K190

.81.CKW

56-K178

50006-K01**

250 XC-F

2016 - 22 250 78mm

.78.CW 250 78mm

56-K178

CW50015**

CW50015K01**

250 XC-F

2023 - 25 250 81mm

250 81mm

51001-K01**

50001-K01**

350 SX-F / XC-F

2011 - 12 350 88mm

.88.CW1

350 88mm

56-K152

51003-K01**

50003-K01**

350 SX-F / XC-F

2013 - 15 350 88mm

.88.CW2

350 88mm

56-K152

.90.CKW

56-K191

50007**

50007-K03**

350 SX-F / XC-F

2016 - 18 350 88mm

350 88mm

CW51008K01**

350 SX-F / XC-F

2019 - 22 350 88mm

.88.CYL.CW 350 88mm

.88.CK.CW

56-K2917

56-K2917

CW51008K01**

350 XCF-W

2020 - 22 350 88mm

.88.CYL.CW 350 88mm

.88.CK.CW

56-K2917

56-K2917

CW50009K02** CW50009K02**

450 EXC-F

2017 - 21 2017 - 19

450 95mm 450 95mm

450 EXC-F Six Days

450 SMR

2021 - 22 450 95mm 2016 - 22 450 95mm

.95.CYL.CW 450 95mm .95.CYL.CW 450 95mm

.95.CK.CW .95.CK.CW

56-K2918 56-K2918

56-K2918 56-K2918

450 SX-F / XC-F 450 SX-F / XC-F 450 SX-F Factory 450 SX-F Factory 450 SX-F Factory

CW50009K03**

2023

450 95mm

.95.CYL.CW 450 95mm .95.CYL.CW 450 95mm

56-K2918 56-K2918 56-K2918

2015 - 20 450 95mm

.95.CK.CW

56-K2918

2021 2022

450 95mm

.95.CYL.CW

CW50009K03**

450 95mm

500 EXC-F 500 EXC-F 500 EXC-F

2017 - 22 510 95mm 2023 - 24 510 95mm

.95.CYL.CW 510 95mm

.95.CK.CW

56-K2919 56-K2919 56-K2919 56-K2919 56-K2919 56-K2919 56-K2919

56-K2919

.95.CYL.CW .95.CYL.CW

2025

510 95mm

500 EXC-F Six Days 500 EXC-F Six Days 500 EXC-F Six Days

2020 - 22 510 95mm

.95.CYL.CW 510 95mm

.95.CK.CW

56-K2919

2023 2025

510 95mm 510 95mm

.95.CYL.CW .95.CYL.CW

500 XCF-W

2020 - 22 510 95mm

.95.CYL.CW 510 95mm

.95.CK.CW

56-K2919

**Please note these items are By Order Only

*Please visit our website for current prices E108

www.oro2u.com

Tel: 01597 822 666

Fax: 01597 825 224

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