BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1376 PISTONS •Machined from 2618-T6 high-tensile forged aluminum •Dome/dish features smooth flowing radii; require no deburring or preparation •JE designs are specifically engineered for extreme applications including professional competition •Pro Series pistons available for select models: features include internal and external bracing, dedicated embossed forgings for weight reduction, specialized processes such as internal milling the internal struts, along with dedicated accumulator groove and forged side relief • Pins, pin fitment, lock and rings included •Made in the U.S.A. FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO WEIGHT (GRAMS) SKIRT PART # GASGAS EC 450F 24, EX/MC 450F 23-24 450cc STD 95 mm 13.5:1 - FSR 0910-6852 450cc STD 95 mm 14:1 - FSR 0910-6853 HONDA CRF150R 07-12 149cc STD 66 mm 12.5:1 112 FSR 0910-5873 170cc +4 mm 70 mm 13:1 126 FSR 0910-5878 CRF250R 04-09, CRF250X 04-17 249cc STD 78 mm 13.2:1 150 FSR 0910-5852 Pro Series 249cc STD 78 mm 13.7:1 150 FSR 0910-5879 CRF250R 10-15 249cc STD 76.8 mm 13.8:1 149 FSR 0910-5904 Pro Series 249cc STD 76.8 mm 14.2:1 151 FSR 0910-5905 CRF250R/RX 20-24 249cc STD 79 mm 14:1 154 FSR 0910-6551 249cc STD 79 mm 14.5:1 155 FSR 0910-6552 XR250 86-04, XR250L 91-96 277cc +4 mm 77 mm 10.5:1 215 Round 0910-5836 XR400R 96-04 406cc +1 mm 86 mm 10.6:1 294 Round 0910-5837 415cc +2 mm 87 mm 10.8:1 294 Round 0910-5838 415cc +2 mm 87 mm 12:1 285 Round 0910-5829 426cc +3 mm 88 mm 11:1 298 Round 0910-5841 426cc +3 mm 88 mm 13:1 318 Round 0910-5840 435cc +4 mm 89 mm 10.8:1 273 Round 0910-5853 435cc +4 mm 89 mm 12.0:1 268 Round 0910-5830 CRF450R 02-08, CRF450X 05-17 449cc STD 96 mm 12.5:1 273 FSR 0910-5886 449cc STD 96 mm 13.5:1 282 FSR 0910-5887 488cc +4 mm 100 mm 12.5:1 303 FSR 0910-5888 CRF450R 02-08, CRF450X 05-17 449cc STD 96 mm 13.5:1 255 FSR 0910-5872 Pro Series 449cc STD 96 mm 14:1 256 FSR 0910-5903 CRF450R 09-12 – Pro Series 449cc STD 96 mm 13.5:1 253 FSR 0910-5890 CRF450R 13-16 - Pro Series 449cc STD 96 mm 13.5:1 257 FSR 0910-5923 CRF450R/CRF450RX 17-21, CRF450RWE 19-24 449cc STD 96 mm 13.5:1 NEW FSR 0910-5943 Pro Series 449cc STD 96 mm 14:1 NEW FSR 0910-5944 449cc STD 96 mm 14.5:1 NEW FSR 0910-5945 XR600R 85-01 640cc +4 mm 101 mm 10.6:1 397 Round 0910-5832 654cc +5 mm 102 mm 10.8:1 395 Round 0910-5833 XR650L 93-23 650cc +1 mm 101 mm 9:1 389 Round 0910-5906 644cc STD 100 mm 10.5:1 398 Round 0910-5912 650cc +1 mm 101 mm 10.5:1 396 Round 0910-5913 657cc +2 mm 102 mm 10.5:1 408 Round 0910-5914 644cc STD 100 mm 11.25:1 399 Round 0910-5834 657cc +2 mm 102 mm 11.25:1 406 Round 0910-5839 HUSABERG FE 450 13-14 450cc STD 95 mm 13.5:1 259 FSR 0910-5934 HUSQVARNA FC 450 14-15, FE 450 14-16, FX 450 17 450cc STD 95 mm 13.5:1 259 FSR 0910-5934 FC 450 23-25, FE/FS/FX 450 23-24 450cc STD 95 mm 13.5:1 - FSR 0910-6852 450cc STD 95 mm 14:1 - FSR 0910-6853 KAWASAKI KX250F 17-18 - Pro Series 249cc STD 77 mm 14:1 - FSR 0910-5948 KX250 21-22 249cc STD 78 mm 14.1:1 142 FSR 0910-6390 249cc STD 78 mm 14.5:1 142 FSR 0910-6391 KX250 23-24 249cc STD 78 mm 14.5:1 FSR 0910-6680 KLX400 03 398cc STD 90 mm 12:1 287 Round 0910-5842 434cc +4 mm 94 mm 12:1 303 FSR 0910-5843 0910-5837 0910-5857
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