BOLD MAGENTA part numbers are new for 2025 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2025 PISTON & PISTON KITS 1377 PISTON KITS continued on next page. PISTONS (CONT) FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO WEIGHT (GRAMS) SKIRT PART # KAWASAKI (CONT) KX450F 06-14/16-18 (does not fit 15) 449cc STD 96 mm 12.8:1 272 FSR 0910-5899 449cc STD 96 mm 13.5:1 275 FSR 0910-5900 449cc STD 96 mm 12.8:1 258 FSR 0910-5901 449cc STD 96 mm 13.5:1 264 FSR 0910-5902 KX450 21-23 449cc STD 96 mm 12.5:1 - FSR 0910-6678 449cc STD 96 mm 13.5:1 - FSR 0910-6679 KX450 24 449cc STD 95 mm 13:1 - FSR 0910-6850 449cc STD 95 mm 13.5:1 - FSR 0910-6851 KTM 450 SX-F 13-15, 450 EXC/XC-F/XC-W 12-16 450cc STD 95 mm 13.5:1 259 FSR 0910-5934 450 SX-F/XC-F 23-25, 450 EXC-F/XCF-W/SMR 23-24 450cc STD 95 mm 13.5:1 - FSR 0910-6852 450cc STD 95 mm 14:1 - FSR 0910-6853 SUZUKI RM-Z250 10-18 – Pro Series 249cc STD 77 mm 14.2:1 151 FSR 0910-5908 DR-Z400 00-24 398cc STD 90 mm 12:1 287 Round 0910-5842 434cc +4 mm 94 mm 12:1 303 FSR 0910-5843 RM-Z450 13-24 449cc STD 96.0 mm 13.5:1 258 FSR 0910-5929 Pro Series 449cc STD 96.0 mm 14.5:1 266 FSR 0910-5930 DR650 96-11 650cc STD 100 mm 10.5:1 375 Round 0910-5759 YAMAHA YZ250F 05-13,WR250F 05-13 249cc STD 77 mm 13.5:1 167 FSR 0910-5857 270cc +3 mm 80 mm 13:1 178 FSR 0910-5858 YZ250F 14-18,YZ250FX 15-19,WR250F 15-17 250cc STD 77 mm 13.5:1 149 FSR 0910-5931 Pro Series 2-ring 250cc STD 77 mm 14:1 152 FSR 0910-5932 250cc STD 77 mm 14.5:1 154 FSR 0910-5933 YZ250F 19-24,YZ250FX 20-24,WR250F 20-24 250cc STD 77 mm 14:1 142 FSR 0910-6543 250cc STD 77 mm 14.5:1 143 FSR 0910-6544 YZ450F 05-09,WR450F 05-15 478cc +3 mm 98 mm 13:1 288 FSR 0910-5859 YZ450F 14-17,YZ450FX 16-17, WR450F 16-17 - Pro Series 2-ring 450cc STD 97 mm 14:1 268 FSR 0910-5939 YZ450F 23-24 450cc STD 97 mm 14:1 - FSR 0910-6854 XT/TT500 76-81 540cc +3 mm 97 mm 11:1 342 Round 0910-5835 PISTON KITS •Forged from aerospace-grade aluminum alloys and heat-treated for strength and durability using Wossner’s state-of-the-art heat treatment process •CNC machined using MAZAK® advanced technology maintaining high precision and accuracy through every machining step •Reduced product distortion and variability • Enhanced piston pin oiling slots, radial boss machining and annular grooves for improved wrist pin lubrication •Piston skirt profile and camming are specifically tailored to each application for reduced friction, smooth operation and reduced noise from rockover •Piston skirts are coated for reduced friction and improved break in performance •Select applications have coating treatments to protect from harsh tuning environments •Piston rings are made from premium alloy steel and feature treatments to improve ring seal and extend wear life • Kits include piston, piston rings, piston pin and retaining clips 4-STROKE KITS •Crown options available for stock and altered compression ratios •Ring land treatments for improved ring seal and oil control, as well as gas porting on featured applications for the strongest compression ring seal 2-STROKE KITS •Offered in standard graded sizes as well as oversizes for select applications • Optimized machining for lightness, as well as maintaining strength in key areas such as crown and skirt wall cross sections •External machining optimized to prevent port venting for extreme applications with race porting FITS MODEL BORE SIZE (MM) PISTON SIZE (MM) OVERSIZE PISTON KIT PART # REPLACEMENT RING SET PART # BETA 125 RR 2T 18-22 51.01 53.96 0.01 0910-4885 - 54 53.95 STD 0910-4884 - 54 53.95 STD 0910-48692 - 54.01 53.96 0.01 0910-48702 - 54.02 53.97 0.02 0910-48712 - 2 Dual ring.
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