BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1388 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # HONDA (CONT) CRF450R/RX 17-20 Standard Bore cylinder (only) - 96 0931-0712 Standard Bore kit 13.5:1 96 0931-0713 Standard Bore high-compression kit 14.4:1 96 0931-0714 +3 mm Big Bore kit 13.51 99 0931-0715 +3 mm Big Bore gasket kit - - 0934-6004 CRF450X 05-17 Standard Bore cylinder (only) - 96 0931-1013 Standard Bore kit 12.1:1 96 0931-0274 HUSQVARNA TC 50 17-23 Standard Bore cylinder (only) - 39.5 0931-1022 TC 50 Mini 18-23 Standard Bore cylinder (only) - 39.5 0931-1022 TC 65 17-23 Standard Bore cylinder (only) - 45 0931-1015 FC 250 16-22 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 FE 250 14-15 Standard Bore kit - 78 0931-0492 +3 mm Big Bore, 270cc kit 13.9:1 - 0931-0491 FC 350 16-18 Standard Bore cylinder (only) - 88 0931-0720 Standard Bore kit 14:1 88 0931-0721 +2 mm Big Bore kit 14:1 90 0931-0723 +2 mm Big Bore gasket kit - - 0934-6006 FC/FX 350 19-22 Standard Bore kit 14:1 90 0931-0967 FE 350/S 20-22 Standard Bore kit 14:1 90 0931-0967 KAWASAKI KX85 06-13 Standard Bore cylinder (only) - 48.5 0931-0580 KX250F 04-08 Standard Bore cylinder (only) - 77 0931-0130 KX250F 04-05 Standard Bore kit 12.6:1 77 0931-0275 KX250F 06-08 Standard Bore kit 13.5:1 77 0931-0276 KX250F 04-08 +3 mm Big Bore, 270cc kit 12.6:1 80 0931-0120 Big Bore gasket kit - - 0934-1525 KX250F 09 Standard Bore cylinder (only) - 77 0931-0398 Standard Bore kit 13.2:1 77 0931-0277 +3 mm Big Bore gasket kit - - 0934-1929 KX250F 10 Standard Bore cylinder (only) - 77 0931-0399 Standard Bore kit 13.2:1 77 0931-0341 KX250F 11-14 Standard Bore cylinder (only) - 77 0931-0400 Standard Bore kit - 77 0931-0423 +3 mm Big Bore, 269cc kit 13.5:1 80 0931-0424 KX250F 15-16 Standard Bore cylinder (only) - 77 0931-0400 Standard Bore cylinder kit 13.8:1 77 0931-0592 KX250F 17 Standard Bore cylinder (only) - 77 0931-0725 +3 mm Big Bore kit (uses Vertex #24237) 13.7:1 80 0931-0724 KX250F 18-19 Standard Bore cylinder (only) - 77 0931-0725 Standard Bore kit 13.4:1 77 0931-0727 Standard Bore high-compression kit - 77 0931-0729 +3 mm Big Bore kit (uses Vertex #24237) 13.7:1 80 0931-0724 KLX400 03-04 Standard Bore cylinder (only) - 90 0931-0139 Standard Bore kit 11.3:1 90 0931-0283 +4 mm Big Bore, 434cc kit 11.3:1 94 0931-0135 Big Bore gasket kit - - 0934-1527 KX450F 09-12 Standard Bore cylinder kit 13.2:1 96 0931-0596 Big Bore cylinder kit 12.5:1 98 0931-0603 KX450F 13-14 Standard Bore cylinder kit 12.5:1 96 0931-0598 KX450F 15 Standard Bore cylinder (only) 12.8:1 96 0931-0582 Standard Bore cylinder kit 12.8:1 96 0931-0600 KTM 50 SX/SX Mini 09-23 Standard Bore cylinder (only) - 39.5 0931-1022 50 SX Pro Jr 09 Standard Bore cylinder (only) - 39.5 0931-1022 50 SXS 11-14 Standard Bore cylinder (only) - 39.5 0931-1022 65 SX 09-23 Standard Bore kit (uses Vertex #23430) - 45 0931-0500 Standard Bore cylinder (only) - 45 0931-1015 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # KTM (CONT) 65 SXS 13-14 Standard Bore cylinder (only) - 45 0931-1015 65 XC 09 Standard Bore cylinder (only) - 45 0931-1015 250 EXC-F 14 Standard Bore kit - 78 0931-0492 +3 mm Big Bore, 276cc kit 13.9:1 - 0931-0491 250 SX-F/XC-F 06-12 Standard Bore cylinder (only) - 76 0931-0404 Standard Bore kit 12.8:1 76 0931-0408 +4 mm Big Bore, 276cc kit 13.3:1 80 0931-0411 Big Bore gasket kit - - 0934-2370 250 SX-F/XC-F 16-22 Standard Bore cylinder (only) - 78 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 - - 0931-0719 +3 mm Big Bore gasket kit - - 0934-6005 350 EXC-F/ XCF-W 20-22 Standard Bore kit 14:1 90 0931-0967 350 SX-F/XC-F 11-12 Standard Bore cylinder (only) - 88 0931-0403 Standard Bore kit 13.5:1 88 0931-0406 +2 mm Big Bore, 365cc kit 13.5:1 90 0931-0410 Big Bore gasket kit - - 0934-2369 350 SX-F/XC-F 13-15 Standard Bore kit (uses Vertex #23831) 13.6:1 88 0931-0497 +2 mm Big Bore, 365cc kit (uses Vertex #23236) 13.5:1 - 0931-0495 350 SX-F/XC-F 16-18 Standard Bore cylinder (only) - 88 0931-0720 Standard Bore kit (uses Vertex #24098) 14:1 88 0931-0721 +2 mm Big Bore kit 14:1 90 0931-0723 +2 mm Big Bore gasket kit - - 0934-6006 350 SX-F/XC-F 19-22 Standard Bore kit 14:1 90 0931-0967 SUZUKI RM-Z250 04-06 Standard Bore cylinder (only) - 77 0931-0130 Standard Bore kit 12.6:1 77 0931-0275 +3 mm Big Bore, 270cc 12.6:1 80 0931-0120 Big Bore gasket kit - - 0934-1525 RM-Z250 07-09 Standard Bore cylinder (only) - 77 0931-0401 Standard Bore kit 13.4:1 77 0931-0352 RM-Z250 10-12 Standard Bore cylinder (only) - 77 0931-0402 Standard Bore kit 13.4:1 77 0931-0343 Big Bore gasket kit - - 0934-2151 RM-Z250 13-15 Standard Bore cylinder (only) - 77 0931-0402 Standard Bore kit (uses Vertex #23861) 13.5:1 77 0931-0502 +3 mm Big Bore, 269cc kit 13.5:1 80 0931-0501 Big Bore gasket kit - - 0934-2151 RM-Z250 16-18 Standard Bore cylinder (only) - 77 0931-0402 Standard Bore kit (uses Vertex #24122) 13.75:1 77 0931-0675 +3 mm Big Bore, 269cc kit 13.5:1 80 0931-0501 Big Bore gasket kit - - 0934-2151 DR-Z400 00-22 Standard Bore cylinder (only) - 90 0931-0139 Standard Bore kit 11.3:1 90 0931-0283 +4 mm Big Bore, 434cc kit 11.3:1 94 0931-0135 Big Bore gasket kit - - 0934-1527 YAMAHA YZ85 02-14 +5 mm Big Bore, 103.5cc kit (must modify cyl. head) 8.2:1 52.5 0931-0346 WR250F 01-04 Standard Bore cylinder (only) - 77 0931-0131 Standard Bore kit 12.7:1 77 0931-0278 Standard Bore high-compression kit 13.5:1 77 0931-0296 +3 mm Big Bore, 269cc kit 12.5:1 80 0931-0121 Big Bore gasket kit - - 0934-1523 WR250F 05-13 Standard Bore cylinder (only) - 77 0931-0131 Standard Bore kit 12.5:1 77 0931-0279 Standard Bore high-compression kit 13.5:1 77 0931-0296 +3 mm Big Bore, 269cc kit 12.5:1 80 0931-0121 CYLINDERS AND CYLINDER KITS (CONT)
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