BOLD MAGENTA part numbers are new for 2026 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2026 PISTON & PISTON KITS 1431 PISTONS continued on next page. FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO WEIGHT (GRAMS) SKIRT PART # GASGAS EC 450F 24-25, EX/MC 450F 23-25 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 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 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 0910-5837 0910-5857 • Pins, pin fitment, lock and rings included •Made in the U.S.A.
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