BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1334 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # YAMAHA (CONT) YZ250F 05-07 Standard Bore cylinder (only) - 77 0931-0131 Standard Bore kit - - 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 Big Bore gasket kit - - 0934-1523 YZ250F 08-13 Standard Bore cylinder (only) - - 0931-0131 Standard Bore cylinder kit 13.5:1 77 0931-0281 +3 mm Big Bore, 269cc kit - - 0931-0121 Big Bore gasket kit - - 0934-1523 YZ250F 14-18, YZ250FX 15-19 Standard Bore cylinder (only) 13.5:1 77 0931-0579 Standard Bore cylinder kit 13.5:1 77 0931-0588 Big Bore cylinder kit 13.5:1 80 0931-0591 Big Bore gasket kit - - 0934-4052 YZ250F 19-23, YZ250FX 20-23 Standard Bore cylinder kit 13.8:1 77 0931-1118 Big Bore gasket kit 80 0934-7521 Standard Bore cylinder (only) 77 0931-1117 +3 mm Big Bore, 270cc kit 13.8:1 80 0931-1021 WR450F 03-06 +3 mm Big Bore, 478cc (uses Vertex #23404) kit - - 0931-0426 478cc Top-End gasket kit - - 0934-2387 YZ450F 03-05 Standard Bore cylinder (only) - 95 0931-0132 Standard Bore kit 12.5:1 95 0931-0280 +3 mm Big Bore, 478cc (uses Vertex #23404) kit - - 0931-0426 478cc Top End gasket kit - - 0934-2387 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # YAMAHA (CONT) YZ450F 06-09, WR450F 07-15 Standard Bore kit 12.5:1 95 0931-0282 Standard Bore high-compression kit 13.5:1 95 0931-0299 +3 mm Big Bore, 478cc kit 12.5:1 98 0931-0174 +3 mm Big bore gasket kit - - 0934-1699 YZ450F 10-13 Standard Bore cylinder (only) - 97 0931-0396 Standard Bore kit 12.5:1 97 0931-0345 +2 mm Big Bore, 470cc kit 12.5:1 99 0931-0354 YZ450F 14-17, YZ450FX 16-18 Standard Bore cylinder (only) - 97 0931-0396 Standard Bore kit 12.5:1 97 0931-0585 Big Bore cylinder kit 12.5:1 99 0931-0590 YZ450F 18-19, WR450F 19-20 Standard Bore cylinder (only) - 97 0931-0848 Standard Bore kit 12.8:1 97 0931-0849 Standard Bore high-compression kit 13.8:1 97 0931-0850 +2 mm Big Bore, 468cc kit 12.7:1 99 0931-0851 YZ450F 20-22, WR450F 21-23 Standard Bore cylinder (only) - 97 0931-1020 YZ450FX 19-20 Standard Bore cylinder (only) - 97 0931-0848 Standard Bore kit 12.8:1 97 0931-0849 +2 mm Big Bore, 468cc kit 12.7:1 99 0931-0851 YZ450FX 21-22 Standard Bore cylinder (only) - 97 0931-1020 CYLINDERS AND CYLINDER KITS (CONT) FITS MODEL PART # HONDA CRF250R 04-07 0930-0129 CRF250R 08 0930-0128 CRF250R 09 0930-0127 CRF250X 04-06 0930-0129 FITS MODEL PART # KAWASAKI KX250F 04-05 0931-1019 KX250F 06-08 0931-1018 SUZUKI RM-Z250 04-06 0931-1019 FITS MODEL PART # YAMAHA YZ125 05-21 0930-0205 YZ250 99-24 0930-0130 CYLINDER HEAD KITS •New replacement cylinder head •Includes cam caps and cam cap bolts •Includes C630 (nickel/aluminum/bronze) valve seats and guides •Competition valve job •Shortened valve guides to accept higher lift cams •Unshrouded combustion chamber 0930-0127 0930-0130 •Blended bowl seat to port •Stock-shaped ports • 4-stroke cylinder head kits do not include valves, springs or lifters •Made in the U.S.A.
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