BOLD MAGENTA part numbers are new for 2024 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2024 PISTON KITS continued on next page. 1361 PISTONS (CONT) FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO WEIGHT (GRAMS) SKIRT PART # SUG. RETAIL KAWASAKI (CONT) KX450 21-23 449cc STD 96mm 12.5:1 - FSR 0910-6678 $316.10 449cc STD 96mm 13.5:1 - FSR 0910-6679 316.10 KTM 450 SX-F 13-15, 450 EXC / XC-F / XC-W 12-16 450cc STD 95mm 13.5:1 259 FSR 0910-5934 316.10 SUZUKI RM-Z250 10-18 – Pro Series 249cc STD 77mm 14.2:1 151 FSR 0910-5908 291.51 DR-Z 400 00-24 398cc STD 90mm 12.0:1 287 Round 0910-5842 254.63 434cc +4mm 94mm 12.0:1 303 FSR 0910-5843 254.63 RM-Z 450 13-24 449cc STD 96.0mm 13.5:1 258 FSR 0910-5929 316.10 Pro Series 449cc STD 96.0mm 14.5:1 266 FSR 0910-5930 316.10 DR 650 96-11 650cc STD 100mm 10.5:1 375 Round 0910-5759 254.63 YAMAHA YZ250F 05-13,WR250F 05-13 249cc STD 77mm 13.5:1 167 FSR 0910-5857 291.51 270cc +3mm 80mm 13.0:1 178 FSR 0910-5858 265.01 YZ250F 14-18,YZ250FX 15-19,WR250F 15-17 250cc STD 77mm 13.5:1 149 FSR 0910-5931 291.51 Pro Series 2-ring 250cc STD 77mm 14.0:1 152 FSR 0910-5932 291.51 250cc STD 77mm 14.5:1 154 FSR 0910-5933 291.51 YZ250F 19-24,YZ250FX 20-24,WR250F 20-24 250cc STD 77mm 14.0:1 142 FSR 0910-6543 275.02 250cc STD 77mm 14.5:1 143 FSR 0910-6544 275.02 YZ450F 05-09,WR450F 05-15 478cc +3mm 98mm 13.0:1 288 FSR 0910-5859 291.51 YZ450F 14-17,YZ450FX 16-17,WR450F 16-17 - Pro Series 3-ring 450cc STD 97mm 12.8:1 268 FSR 0910-5938 316.10 YZ450F 14-17,YZ450FX 16-17,WR450F 16-17 - Pro Series 2-ring 450cc STD 97mm 14.0:1 268 FSR 0910-5939 316.10 XT/TT500 76-81 540cc +3mm 97mm 11.0:1 342 Round 0910-5835 254.63 2 Dual ring. 3 Two ring design. 4 Double bridge forging. FITS MODEL BORE SIZE (MM) PISTON SIZE (MM) OVERSIZE PISTON KIT PART # SUG. RETAIL REPLACEMENT RING SET PART # SUG. RETAIL BETA 125RR Enduro 2T 18-22 54.00 53.95 STD 0910-4884 $117.95 - - 51.01 53.96 +.01 0910-4885 117.95 - - 125RR Enduro 2T 18-22 54.00 53.95 STD 0910-48692 117.95 - - 54.01 53.96 +.01 0910-48702 117.95 - - 54.02 53.97 +.02 0910-48712 117.95 - - 200RR 2T 19-23 62.00 61.95 STD 0910-66322 142.00 - - 62.01 61.96 STD 0910-66332 142.00 - - 62.02 61.97 STD 0910-66342 142.00 - - 300RR Enduro 2T 22-23 73.00 72.95 STD 0910-66292 192.00 - - 73.01 72.96 +.01 0910-66302 192.00 - - 73.02 72.97 +.02 0910-66312 192.00 - - 300 XTrainer 2T 22 73.00 72.95 STD 0910-66292 192.00 - - 73.01 72.96 +.01 0910-66302 192.00 - - 73.02 72.97 +.02 0910-66312 192.00 - - 450RR Enduro 4T 05-09 89.01 88.97 +.01 0910-49333 198.95 - - 525RR Enduro 4T 05-09 95.00 94.95 STD 0910-48953, 4 188.95 0912-0860 $49.95 95.01 94.96 STD 0910-48963, 4 188.95 0912-0860 49.95 GASGAS MC50 2T 21-23 39.50 39.46 STD 0910-4899 86.95 - - 39.51 39.47 +.01 0910-4900 86.95 - - 39.52 39.48 +.02 0910-4901 86.95 - - MC65 2T 21-23 45.02 44.96 STD 0910-4890 91.95 - - 45.03 44.97 +.01 0910-4891 91.95 - - 45.04 44.98 +.02 0910-4892 91.95 - - 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 •Kits are single ring (unless noted) • Wössner piston kits are used by leading Supercross,Arenacross and MX GP teams
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