BOLD MAGENTA part numbers are new for 2023 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2023 CYLINDERS AND CYLINDER KITS continued on next page. FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # SUG. RETAIL GAS GAS MC50 21-23 Standard Bore cylinder (only) - 39.5 0931-1022 $329.95 MC65 21-23 Standard Bore cylinder (only) - 45 0931-1015 479.95 EX250F, MC250F 21-23 Standard Bore cylinder (only) - - 0931-0716 409.95 Standard Bore kit 14.4:1 78 0931-0717 679.95 Standard Bore high-compression kit 14.7:1 78 0931-0718 699.95 + 3mm Big Bore kit 14.4:1 81 0931-0719 759.95 +3mm Big Bore gasket kit - - 0934-6005 114.95 EX350F 21-23 Standard Bore kit 14.0:1 90 0931-0967 699.95 HONDA CRF150R/RB 07-09 Standard Bore kit 11.7:1 66 0931-0269 419.24 Standard Bore cylinder (only) - 66 0931-0163 269.95 Standard Bore high-compression kit - 66 0931-0288 439.84 CRF150R/RB 12-22 Standard Bore kit 11.7:1 66 0931-0486 411.02 Standard Bore cylinder (only) - 66 0931-0163 269.95 +2mm Big Bore, 159cc kit 11.7:1 68 0931-0485 509.90 CRF250R 04-07 Standard Bore cylinder (only) - 78 0931-0128 279.90 Standard Bore kit 12.9:1 78 0931-0270 454.45 Standard Bore high-compression kit 13.4 78 0931-0289 484.14 +3mm Big Bore, 269cc kit 13.0:1 81 0931-01181 551.31 +3mm Big Bore gasket kit - - 0934-1521 51.46 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # SUG. RETAIL HONDA (CONT) CRF250R 08-09 Standard Bore cylinder (only) - 78 0931-0128 $279.90 Standard Bore kit 13.0:1 78 0931-0271 463.54 Standard Bore high-compression kit - - 0931-0290 490.32 +3mm Big Bore, 269cc kit 13.0:1 81 0931-0118 551.31 +3mm Big Bore gasket kit - - 0934-1521 51.46 CRF250R 10-13 Standard Bore cylinder (only) - 76.8 0931-0392 309.95 Standard Bore kit 13.2:1 76.8 0931-0338 454.45 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 555.45 +3.2mm Big Bore gasket kit - - 0934-2383 60.55 CRF250R 14-15 Standard Bore cylinder (only) - 76.8 0931-0392 309.95 Standard Bore cylinder kit 13.5:1 76.8 0931-0583 463.54 Standard Bore high-compression kit 14.1:1 76.8 0931-0584 484.75 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 555.45 +3.2mm Big Bore gasket kit - - 0934-2383 60.55 CRF250R 16-17 Standard Bore cylinder (only) - 76.8 0931-0392 309.95 Standard Bore kit 13.5:1 76.8 0931-0674 463.54 Standard Bore high-compression kit 14.3:1 76.8 0931-0707 494.85 +3.2mm Big Bore, 270cc kit 13.2:1 80 0931-0340 555.45 +3.2mm Big Bore gasket kit - - 0934-2383 60.55 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 1183-1199 • Made in the U.S.A. 0931-0270 1 Requires case machining; instructions included. 1129
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