BOLD MAGENTA part numbers are new for 2026 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2026 PISTON & PISTON KITS 1387 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # GASGAS MC 50 21-23 Standard Bore cylinder (only) - 39.5 0931-1022 MC 65 21-23 Standard Bore cylinder (only) - 45 0931-1015 EX 250F, MC 250F 21-23 Standard Bore cylinder (only) - - 0931-0716 Standard Bore kit 14.4:1 78 0931-0717 Standard Bore high-compression kit 14.7:1 78 0931-0718 +3 mm Big Bore kit 14.4:1 81 0931-0719 +3 mm Big Bore gasket kit - - 0934-6005 EX 350F 21-22, MC 350F 22 Standard Bore kit 14:1 90 0931-0967 HONDA CRF150R/RB 07-09 Standard Bore kit 11.7:1 66 0931-0269 Standard Bore cylinder (only) - 66 0931-0163 Standard Bore high-compression kit - 66 0931-0288 CRF150R/RB 12-24 Standard Bore kit 11.7:1 66 0931-0486 Standard Bore cylinder (only) - 66 0931-0163 +2 mm Big Bore, 159cc kit 11.7:1 68 0931-0485 CRF250R 04-07 Standard Bore cylinder (only) - 78 0931-0128 Standard Bore kit 12.9:1 78 0931-0270 Standard Bore high-compression kit 13.4 78 0931-0289 +3 mm Big Bore, 269cc kit 13:1 81 0931-01181 +3 mm Big Bore gasket kit - - 0934-1521 CRF250R 08-09 Standard Bore cylinder (only) - 78 0931-0128 Standard Bore kit 13:1 78 0931-0271 Standard Bore high-compression kit - - 0931-0290 +3 mm Big Bore, 269cc kit 13:1 81 0931-0118 +3 mm Big Bore gasket kit - - 0934-1521 CRF250R 10-13 Standard Bore cylinder (only) - 76.8 0931-0392 Standard Bore kit 13.2:1 76.8 0931-0338 +3.2 mm Big Bore, 270cc kit 13.3:1 80 0931-0340 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # HONDA (CONT) CRF250R 14-15 Standard Bore cylinder (only) - 76.8 0931-0392 Standard Bore cylinder kit 13.5:1 76.8 0931-0583 Standard Bore high-compression kit 14.1:1 76.8 0931-0584 +3.2 mm Big Bore, 270cc kit 13.3:1 80 0931-0340 CRF250R 16-17 Standard Bore cylinder (only) - 76.8 0931-0392 Standard Bore kit 13.5:1 76.8 0931-0674 +3.2 mm Big Bore, 270cc kit 13.3:1 80 0931-0340 CRF250R 18-19 Standard Bore kit 13.9:1 79 0931-0845 Standard Bore high-compression kit 14.6:1 79 0931-0846 +3 mm Big Bore, 468cc kit 13.9:1 82 0931-0847 +3 mm Big Bore gasket kit - - 0934-6344 CRF250RX 19 Standard Bore kit 13.9:1 79 0931-0845 Standard Bore high-compression kit 14.6:1 79 0931-0846 +3 mm Big Bore, 468cc kit 13.9:1 82 0931-0847 +3 mm Big Bore gasket kit - - 0934-6344 CRF250X 04-17 Standard Bore cylinder (only) - 78 0931-0128 Standard Bore kit 12.9:1 78 0931-0270 Standard Bore high-compression kit 13.4 78 0931-0289 +3 mm Big Bore, 269cc kit 13:1 81 0931-01181 +3 mm Big Bore gasket kit - - 0934-1521 CRF450R 02-06 Standard Bore cylinder (only) - 96 0931-0129 Standard Bore kit 12.1:1 96 0931-0272 Standard Bore high-compression kit 12.5:1 96 0931-0291 +4 mm Big Bore, 488cc kit 12.1:1 100 0931-0119 Big Bore gasket kit - - 0934-1522 CRF450R 07-08 Standard Bore kit 12.1:1 96 0931-0839 Standard Bore high-compression kit 12.5:1 96 0931-0841 CRF450R 09-12 Standard Bore kit 12:1 96 0931-0273 Standard Bore cylinder (only) - 96 0931-0391 CRF450R 13-16 Standard Bore kit 12.5:1 96 0931-0489 Standard Bore cylinder (only) - 96 0931-0391 1 Requires case machining; instructions included. 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 CYLINDERS AND CYLINDER KITS continued on next page. 0931-0270 • 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 1443-1456 •Made in the U.S.A.
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