BOLD MAGENTA part numbers are new for 2023 ENGINE PARTSCANADA .COM OFFROAD | 2023 593 DISCLAIMER: SEE PAGE 6 FOR IMPORTANT INFORMATION REGARDING CERTAIN WARRANTY AND EMISSION CONTROL REGULATION COMPLIANCE AND NOISE REGULATION INFORMATION. CYLINDERS AND CYLINDER KITS continued on next page. FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # GAS GAS MC50 21-23 Standard Bore cylinder (only) - 39.5 0931-1022 MC65 21-23 Standard Bore cylinder (only) - 45 0931-1015 EX250F, MC250F 21-23 Standard Bore cylinder (only) - - 0931-0716 Standard Bore kit 14.4:1 78 0931-0717 +3mm Big Bore gasket kit - - 0934-6005 HONDA CRF150R/RB 07-09 Standard Bore cylinder (only) - 66 0931-0163 CRF150R/RB 12-22 Standard Bore kit 11.7:1 66 0931-0486 Standard Bore cylinder (only) - 66 0931-0163 CRF250R 04-07 Standard Bore cylinder (only) - 78 0931-0128 Standard Bore kit 12.9:1 78 0931-0270 CRF250R 08-09 Standard Bore cylinder (only) - 78 0931-0128 CRF250R 10-13 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 CRF250R 14-15 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 CRF250R 16-17 Standard Bore kit 13.5:1 76.8 0931-0674 Standard Bore high-compression kit 14.3:1 76.8 0931-0707 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 CRF250X 04-17 Standard Bore cylinder (only) - 78 0931-0128 Standard Bore kit 12.9:1 78 0931-0270 CRF450R 02-06 Standard Bore cylinder (only) - 96 0931-0129 +4mm Big Bore, 488cc kit 12.1:1 100 0931-0119 Big Bore gasket kit - - 0934-1522 CRF450R 09-12 Standard Bore kit 12.0:1 96 0931-0273 +3mm Big Bore, 478cc kit 12.5:1 96 0931-0266 CRF450R/RX 17-18 Standard Bore high-compression kit 14.4:1 96 0931-0714 +3mm Big Bore gasket kit - - 0934-6004 CYLINDERS AND CYLINDER KITS • Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders • Three kit options to choose from: Standard Bore, Standard Bore high-compression and Big Bore • Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise • Nickel silicon carbide-plated for long life • Kits come complete with gaskets, cylinder, piston, rings, pin and clips • Big bore cylinders do not require machine work (unless noted) • Replacement Vertex piston, rings, clips and pins also available; see pages 567-575 • Made in the U.S.A.
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