BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1330 FITS MODEL DESCRIPTION PART # HONDA CRF150R 07-10 Cylinder kit (69 mm big bore) 163.5cc 0931-0307 Repl. ring set 0912-0331 Gasket kit 0934-1968 CRF230F 07-15 Cylinder kit (67 mm big bore) 233cc 0931-0662 Gasket kit 0934-4814 CRF250R/X 04-09 Forged piston kit A (81.95 mm piston) 0910-0646 Gasket kit 0934-1054 CRF250R 18-22 Cylinder kit (85 mm big bore; 13.7:1 compression) 289cc 0931-0956 Cylinder kit (standard bore) 0931-0955 CRF450R 02-08 Forged piston kit A (99.95 mm, 11.6:1 compression, for 100 mm big bore/490cc) 0910-0255 CRF450R 17-22 Cylinder kit (standard bore) 0931-0957 HUSQVARNA FC 250 14-15 Repl. forged piston A 0910-3414 Gasket kit (82 mm) 0934-3157 FC 250 16-22 Repl. forged piston 0910-3414 Gasket kit (82 mm) 0934-5491 FE 250 17-19 Cylinder kit (82 mm big bore) 276cc 0931-0865 Repl. forged piston 0910-3414 Gasket kit 0934-5491 FC 350 14-15 Repl. forged piston 0910-2764 FE 350 14-16 Repl. forged piston 0910-2764 KAWASAKI KX65 02-21 Cylinder kit (50 mm big bore) 80cc 0931-0107 Gasket kit (50 mm big bore) 0934-1533 FITS MODEL DESCRIPTION PART # KAWASAKI (CONT) KX125 03-07 Cylinder kit (54 mm) 125cc 0931-0012 Cylinder kit (58 mm big bore) 144cc 0931-0109 Cast piston kit A (57.935 mm) 0910-0877 Cast piston kit B (57.945 mm) 0910-0878 Gasket kit (54 mm) 0934-0190 Repl. ring set 0912-0160 Repl. ring set 0912-0104 Gasket kit (58 mm) 0934-2135 KX250F 04-08 Repl. ring set 0912-0159 Gasket kit (83 mm) 0934-0359 KX250F 09-10 Cylinder kit (83 mm big bore) 290cc 0931-0308 Forged piston kit B 0910-0884 Repl. ring set 0912-0159 Gasket kit (83 mm) 0934-2136 KX250F 11-16 Forged piston kit B 0910-0884 Repl. ring set 0912-0159 Gasket kit (83 mm) 0934-2136 KLX400 03-06 Cylinder kit (standard bore) 0931-0015 Cylinder kit (94 mm big bore) 435cc 0931-00161 Gasket kit 0934-0194 KX450F 09-15 Cylinder kit (100 mm big bore) 490cc 0931-0328 Repl. forged piston 0910-2535 Repl. ring set 0912-0374 Gasket kit (100 mm) 0934-2552 KX450F 16-18 Cylinder kit (standard bore) 0931-0961 Repl. forged piston 0910-2535 Repl. ring set 0912-0374 CYLINDER KITS •Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets •Forged piston black graphite or clear tin coating; includes rings, clips and pin •Athena top-end gasket set includes required seals and hardware •Easy-to-follow step-by-step installation instructions •Most are bolt-on; no machining required except where noted STOCK BORE RACE CYLINDER KITS •Include aluminum cylinder with nickel-carbide coating, ported to Factory Works specs •Two-stroke kits include an aluminum cylinder head with a removable bronze dome allowing for a higher compression ratio and anti-detonation features (except where noted) • Two-stroke kits feature specially designed, high-performance, hard-anodized power valves (cannot use OEM) • Specially designed, high-performance, Cast-Lite flat-top piston kit •Athena top-end gasket set including required seals and hardware • Easy-to-follow, step-by-step installation instructions 2-stroke cylinder kit 4-stroke cylinder kit BIG BORE RACE CYLINDER KITS •Include aluminum cylinder with nickel-carbide coating • Specially designed, high-performance, hard-anodized power valves (cannot use OEM) • Specially designed, high-performance, forged OEM-style domed piston kit •Athena top-end gasket set including required seals and hardware • Easy-to-follow, step-by-step installation instructions NOTE: All 4-stroke kits do not include cylinder head.
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