BOLD MAGENTA part numbers are new for 2025 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2025 PISTON & PISTON KITS 1391 FITS MODEL DIAMETER (MM) PISTON VERSION PISTON PART # RING SET PART # WRIST PIN PART # CIRCLIP PART # COBRA CX 50 JR/SR 06-17 38.94 Cast Replica 0910-4134 - - - 38.95 Cast Replica 0910-4135 - - - 38.96 Cast Replica 0910-4136 - - - CX 65 07-09, 12-16 44.45 Cast Replica 0910-4137 - - - GASGAS MC 50 21 39.47 Cast Replica 0910-2065 0912-0346 0913-0103 0913-0058 MC 65 21 44.97 Cast Replica 0910-1835 0912-0165 - 0913-0048 MC 85 21 46.94 Cast Replica 0910-5163 0912-0163 0913-0027 0913-0048 46.95 Cast Replica 0910-5164 0912-0163 0913-0027 0913-0048 46.96 Cast Replica 0910-5165 0912-0163 0913-0027 0913-0048 MC 125 21 53.94 Cast Replica 0910-5155 - 0913-0019 0913-0054 53.95 Cast Replica 0910-5156 - 0913-0019 0913-0054 53.96 Cast Replica 0910-5157 - 0913-0019 0913-0054 MC 125 21 53.94 Cast Race 0910-5159 - 0913-0019 0913-0054 53.95 Cast Race 0910-5160 - 0913-0019 0913-0054 53.96 Cast Race 0910-5161 - 0913-0019 0913-0054 EC 250 02-07 66.34 Cast Replica 0910-2553 0912-0175 0913-0038 0913-0056 EC 250 21 66.34 Cast Replica 0910-2066 0912-0347 0913-0038 0913-0047 66.35 Cast Replica 0910-2067 0912-0347 0913-0038 0913-0047 EC 250F 21 77.96 Forged Replica 0910-5140 - - - 77.97 Forged Replica 0910-5141 - - - MC 250F 21 77.96 Forged Replica 0910-4076 - - - 77.97 Forged Replica 0910-4077 - - - PISTON KITS, RINGS, WRIST PINS AND CIRCLIPS • All pistons are heat-treated with a T-5 hardening and tempering cycle •All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life •Cast piston kits are gravity-cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston •Forged pistons are forged from 2618 aluminum for superior strength and durability •Forged High Compression pistons improve power and torque across entire rpm range •Big Bore pistons increase engine’s displacement, torque, and peak horsepower •Forged Replica pistons are forged OE replacements •Replica pistons and all rings are OEM replacements • Piston kits include piston, rings, wrist pin and circlips •Replacement 2-stroke piston rings sold individually; 4-stroke piston rings sold as a set PISTON VERSIONS Cast Replica – Cast OE replacement piston Cast Race – Unique cast GP-style race piston with only one compression ring Cast Big Bore – Big bore stock compression cast piston Forged Replica – Forged OE stock compression piston Forged Big Bore – Forged OE stock compression big bore piston Forged Race – Unique forged GP-style race piston with only one compression ring Forged High Comp – Forged high-compression piston PISTON KITS, RINGS,WRIST PINS AND CIRCLIPS continued on next page. 0910-4658 0910-4669 0910-5178
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