BOLD MAGENTA part numbers are new for 2026 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2026 PISTON & PISTON KITS 1433 PISTON KITS continued on next page. 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 2 Dual ring. 3 Two ring design. 4 Double bridge forging. FITS MODEL BORE SIZE (MM) PISTON SIZE (MM) OVERSIZE (MM) PISTON KIT PART # REPLACEMENT RING SET PART # BETA 125 RR 2T 18-25 51.01 53.96 0.01 0910-4885 - 125 RR X-Pro 2T 25-26 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 - 200 RR 2T 19-24 62 61.95 STD 0910-66322 - 200 RR X-Pro 2T 25 62.01 61.96 STD 0910-66332 - 62.02 61.97 STD 0910-66342 - 300 RR 2T 22-23 73 72.95 STD 0910-66292 - 73.01 72.96 0.01 0910-66302 - 73.02 72.97 0.02 0910-66312 - 300 Xtrainer 2T 22 73 72.95 STD 0910-66292 - 73.01 72.96 0.01 0910-66302 - 73.02 72.97 0.02 0910-66312 - 450 RR 4T 05-09 89.01 88.97 0.01 0910-49333 - 525 RR 4T 05-09 95 94.95 STD 0910-48953, 4 0912-0860 95.01 94.96 STD 0910-48963, 4 0912-0860 GASGAS MC 50 21-25 39.5 39.46 STD 0910-4899 - 39.51 39.47 0.01 0910-4900 - 39.52 39.48 0.02 0910-4901 - MC 65 21-25 45.02 44.96 STD 0910-4890 - 45.03 44.97 0.01 0910-4891 - 45.04 44.98 0.02 0910-4892 - MC 85 21-25 47 46.95 STD 0910-4847 - 47.01 46.96 0.01 0910-4848 - 47.02 46.97 0.02 0910-4849 - 47.02 46.97 0.02 0910-66252 - MC 125 21-25 54 53.95 STD 0910-4884 - 54 53.95 STD 0910-48692 - 54.01 53.96 0.01 0910-4885 - 54.01 53.96 0.01 0910-48702 - 54.02 53.97 0.02 0910-48712 - EC 250 21-25 66.4 66.34 STD 0910-48612 - 66.41 66.35 0.01 0910-48622 - 66.42 66.36 0.02 0910-48632 -
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