BOLD MAGENTA part numbers are new for 2023 PARTS-UNLIMITED.COM 2023 | OFFROAD PISTON & PISTON KITS 1178 FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO WEIGHT (GRAMS) SKIRT PART # SUG. RETAIL YAMAHA YZ250F 05-13,WR250F 05-13 249cc STD 77mm 13.5:1 167 FSR 0910-5857 $277.63 270cc +3mm 80mm 13.0:1 178 FSR 0910-5858 252.39 YZ250F 14-18,YZ250FX 15-19,WR250F 15-17 250cc STD 77mm 13.5:1 149 FSR 0910-5931 277.63 Pro Series 2-ring 250cc STD 77mm 14.0:1 152 FSR 0910-5932 277.63 250cc STD 77mm 14.5:1 154 FSR 0910-5933 277.63 YZ450F 05-09,WR450F 05-15 478cc +3mm 98mm 13.0:1 288 FSR 0910-5859 277.63 YZ450F 14-17,YZ450FX 16-17, WR450F 16-17 - Pro Series 3-ring 450cc STD 97mm 12.8:1 268 FSR 0910-5938 301.05 YZ450F 14-17,YZ450FX 16-17, WR450F 16-17 - Pro Series 2-ring 450cc STD 97mm 14.0:1 268 FSR 0910-5939 301.05 XT/TT500 76-81 540cc +3mm 97mm 11.0:1 342 Round 0910-5835 242.50 PISTONS (CONT) FITS MODEL SIZE (MM) PISTON KIT PART # SUG. RETAIL REPLACEMENT RING SET PART # SUG. RETAIL BETA RR125 Enduro 2T 18-22 (Single Ring) 53.95 0910-4884 $117.95 - - 53.96 0910-4885 117.95 - - 53.97 0910-4886 107.95 - - RR125 Enduro 2T 18-22 (Dual Ring) 53.95 0910-4869 117.95 - - 53.96 0910-4870 117.95 - - 53.97 0910-4871 117.95 - - R450 05-09 88.96 0910-4932 198.95 - - 88.97 0910-4933 198.95 - - RR525 05-09 97.95 0910-4923 207.95 0912-0860 $49.95 94.96 0910-4924 207.95 0912-0860 49.95 96.95 - - 0912-0862 49.95 GAS GAS MC50 2T 21-23 39.46 0910-4899 86.95 - - 39.47 0910-4900 86.95 - - 39.48 0910-4901 86.95 - - MC65 2T 21-23 44.96 0910-4890 91.95 - - 44.97 0910-4891 91.95 - - 44.98 0910-4892 91.95 - - MC85 2T 21-23 46.95 0910-4847 91.95 - - 46.96 0910-4848 91.95 - - 46.97 0910-4849 91.95 - - MC125 2T 21-23 (Single Ring) 53.95 0910-4884 117.95 - - 53.96 0910-4885 117.95 - - 53.97 0910-4886 107.95 - - MC125 2T 21-23 (Dual Ring) 53.95 0910-4869 117.95 - - 53.96 0910-4870 117.95 - - 53.97 0910-4871 117.95 - - EC250F 10-15 76.96 - - 0912-0858 49.95 76.97 - - 0912-0858 49.95 76.98 - - 0912-0858 49.95 EC250F Pro series 10-15 76.96 0910-4947 182.95 0912-0755 49.95 76.97 0910-4948 182.95 0912-0755 49.95 76.98 0910-4949 182.95 0912-0755 49.95 MC250 2T 22-23 66.34 0910-4861 150.95 - - EX250 2T 22-23 66.35 0910-4862 150.95 - - EC250 21-23 66.36 0910-4863 150.95 - - EC300 21-23 71.94 0910-5591 188.95 - - FITS MODEL SIZE (MM) PISTON KIT PART # SUG. RETAIL REPLACEMENT RING SET PART # SUG. RETAIL GAS GAS (CONT) MC350F 22-23 87.95 0910-4986 $198.95 0912-0864 $38.95 87.96 0910-4987 198.95 0912-0864 38.95 87.97 0910-4988 198.95 0912-0864 38.95 EX350F 21-23 87.95 0910-4986 198.95 0912-0864 38.95 87.96 0910-4987 198.95 0912-0864 38.95 87.97 0910-4988 198.95 0912-0864 38.95 EC450 03-05 94.95, 94.96, 94.97 - - 0912-0860 49.95 EC450 06-09 94.95 - - 0912-0862 49.95 EC450F 13-14 94.96 0910-4950 198.95 0912-0860 49.95 94.97 0910-4951 198.95 0912-0860 49.95 94.98 0910-4952 198.95 0912-0860 49.95 FE450/HP450 05 94.95, 94.96, 94.97 - - 0912-0860 49.95 HP450 06-09 94.96, 94.97 - - 0912-0862 49.95 MC450F 21-23 94.95 0910-6124 207.95 0912-0860 49.95 94.96 0910-6125 207.95 0912-0860 49.95 94.97 0910-6126 207.95 0912-0860 49.95 EXC450F 21-23 94.95 0910-6124 207.95 0912-0860 49.95 94.96 0910-6125 207.95 0912-0860 49.95 94.97 0910-6126 207.95 0912-0860 49.95 SM450 07-09 94.96, 94.97 - - 0912-0862 49.95 HONDA CR80 92-02 46.95 0910-5581 91.95 - - CR85 03-07 47.45 0910-4835 91.95 - - 47.46 0910-4836 91.95 - - CR125 73-78 55.94 0910-5554 122.95 - - CR125 80-84 55.44 0910-5553 122.95 - - CR125 85-86 53.94 0910-5542 122.95 - - CR125 87 53.94 0910-4839 122.95 - - CR125 88-89 53.94 0910-4838 122.95 - - CR125 92-99 54.45 0910-4720 117.95 - - 54.95 0910-4721 132.95 - - 53.95 0910-4722 117.95 - - 53.96 0910-4723 117.95 - - CR125 00-03 54.45 0910-4775 132.95 - - 53.95 0910-4778 132.95 - - 53.96 0910-4779 132.95 - - 53.97 0910-4780 132.95 - - PISTON KITS • In-house designed and manufactured; all forgings are produced in Wössner’s company-owned forging operation • 4-stroke pistons are made using a double-bridged forging design • Lightweight pistons with the tightest piston-wall clearances in the industry give you a quieter running engine • Standard and oversize pistons for most models, with high compression ratios available for 4-stroke applications • All piston kits include piston, ring, wrist pin and pin locks • Wössner piston kits are used by leading Supercross,Arenacross and MX GP teams
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