BOLD MAGENTA part numbers are new for 2025 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2025 PISTON & PISTON KITS 1331 FITS MODEL DESCRIPTION PART # KTM 65 SX 01-08 Cylinder kit (50 mm big bore) 80cc 0931-0245 Cast piston kit A (49.95 mm piston) 0910-1328 250 SX-F 11-12 Gasket kit (80 mm) 0934-2898 250 SX-F 13-15 Repl. forged piston A 0910-3414 Gasket kit (82 mm) 0934-3157 250 SX-F 16-22 Repl. forged piston 0910-3414 Gasket kit (82 mm) 0934-5491 250 XC-F 07-12 Gasket kit (80 mm) 0934-2898 250 XC-F 16-22 Repl. forged piston 0910-3414 Gasket kit (82 mm) 0934-5491 250 XCF-W 07-13 Gasket kit (80 mm) 0934-2898 250 XCF-W/ EXC-F 14-16 Repl. forged piston A 0910-3414 Gasket kit 0934-3157 250 XCF-W/ EXC-F 17-19 Cylinder kit 0931-0865 Repl. forged piston 0910-3414 Gasket kit 0934-5491 350 SX-F 11-15 Repl. forged piston 0910-2764 350 XC-F 11-13 Repl. forged piston 0910-2764 350 XCF-W/ EXC-F 12-16 Repl. forged piston 0910-2764 SUZUKI RM-Z250 04-06 Repl. ring set 0912-0159 Gasket kit (83 mm) 0934-0359 RM-Z250 07-09 Forged piston kit B (For 83 mm big bore kit) (82.96 mm) 0910-0884 Repl. ring set 0912-0159 RM-Z250 10-18 Forged piston kit B (82.96 mm) 0910-0884 Repl. ring set 0912-0159 Gasket kit 0934-4758 RM-Z250 19-21 Repl. ring set 0912-0159 DR-Z400 00-16 Cylinder kit (standard bore) 0931-0015 Cylinder kit (94 mm big bore) 435cc 0931-00161 Gasket kit 0934-0194 RM-Z450 05-06 Cylinder kit (100 mm) 490cc 0931-0114 Gasket kit 0934-1538 RM-Z450 08-12 Cylinder kit (100 mm big bore) 490cc 0931-0251 Repl. ring set 0912-0374 RM-Z450 13-17 Cylinder kit (96 mm stock bore) 0931-0678 Cylinder kit (100 mm big bore) 490cc 0931-0679 Repl. ring set 0912-0374 YAMAHA YZ85 02-18 Cylinder kit (53 mm big bore) 105cc 0931-0473 Forged piston kit A (52.95 mm piston) 0910-2780 Gasket kit 0934-2912 Repl. ring set 0912-0434 YZ85 19-21 Cylinder kit (47.5 mm stock bore) 0931-0975 Forged piston kit (47.45 mm piston) 0931-0976 YZ125 97-04 Cylinder kit (54 mm stock bore) 125cc 4004851000032 Repl. ring set 0912-0160 Gasket kit 400485160003 Cylinder kit (58 mm big bore) 144cc 0931-02584 Gasket kit 0934-3117 Repl. cast piston kit 0910-0648 Repl. ring set 0912-0104 FITS MODEL DESCRIPTION PART # YAMAHA (CONT) YZ125 Race 01-04 Race cylinder kit (54 mm stock bore) 125cc 4004851000083 Gasket kit 400485160003 YZ125 05-21 Cylinder kit (54 mm stock bore; high compression) 0931-0095 Cylinder kit (58 mm big bore) 144cc 0931-01464 Gasket kit (54 mm) 0934-1055 Gasket kit (58 mm) 0934-1578 Repl. cast piston kit (57,94 mm big bore) 0910-0648 Repl. ring set (54 mm) 0912-0160 Repl. ring set (58 mm) 0912-0104 WR250F 01-12, YZ250F 01-07 Cylinder kit (83 mm) 290cc 0931-0024 Forged Rev dome piston kit B (82.96 mm) 0910-0727 Repl. ring set 0912-0159 Gasket kit (83 mm) 0934-0357 WR250R/X 08-13 Cylinder kit (83 mm big bore) 290cc 0931-0252 Repl. ring set 0912-0159 Gasket kit 0934-1846 YZ250 03-21 Cylinder kit (72 mm big bore) 293cc 0931-0440 Forged piston kit A (71.95 mm) 0910-2666 Forged piston kit B (71.96 mm) 0910-2667 Gasket kit 0934-2584 YZ250F 08-13 Repl. ring set 0912-0159 Gasket kit 0934-0357 WR450F 03-06, YZ450F 03-05 Repl. ring set 0912-0105 Gasket kit (98 mm) 0934-0355 WR450F 07-15 Gasket kit 0934-1057 YZ450F 06-09 Repl. ring set 0912-0105 Gasket kit 0934-1057 YZ450F 10-13 Repl. forged piston (for 102 mm big bore kit) 0910-2539 Gasket kit (102 mm) 0934-2555 YZ450F 14-17 Cylinder kit (standard bore) 0931-0958 Repl. forged piston 0910-2539 Gasket kit (102 mm) 0934-2555 YZ450F 18-19 Cylinder kit (standard bore) 0931-0959 Cylinder kit (102 mm big bore) 496cc 0931-0960 1 This Athena cylinder kit assembled with OE CDI and exhaust gets much more torque (Nxm) than OE bike; in order to strongly increase horsepower to the wheel, it is necessary to use, at least, a racing exhaust system. 2 YZ125 97-98 models require the use of a 99 or newer exhaust pipe and silencer. 3 Cylinder head not included.To use this kit on 97-98 models you must use a 99 exhaust and an 01 cylinder head; for 99-00 models you must use an 01 cylinder head. 4 May require case boring. CYLINDER KITS (CONT)
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