BOLD MAGENTA part numbers are new for 2023 PARTS-UNLIMITED.COM 2023 | OFFROAD PISTON & PISTON KITS FITS MODEL DIAMETER (MM) PISTON VERSION PISTON PART # RING SET PART # WRIST PIN PART # CIRCLIP PART # COBRA CX50 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 - - - CX 65 10-11 42.95 Cast Replica 0910-4139 - - - 42.96 Cast Replica 0910-4140 - - - GAS GAS MC50 21 39.47 Cast Replica 0910-2065 0912-0346 0913-0103 0913-0058 MC65 21 44.97 Cast Replica 0910-1835 0912-0165 - 0913-0048 MC85 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 MC125 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 MC125 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 EC250 02-07 66.34 Cast Replica 0910-2553 0912-0175 0913-0038 0913-0056 EC250 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 EC250F 21 77.96 Forged Replica 0910-5140 - - - 77.97 Forged Replica 0910-5141 - - - MC250F 21 77.96 Forged Replica 0910-4076 - - - 77.97 Forged Replica 0910-4077 - - - MC250F 21 (+2mm big Bore) 80.96 Forged Big Bore 0910-5186 0912-0309 - - 80.97 Forged Big Bore 0910-5187 0912-0309 - - 80.98 Forged Big Bore 0910-5188 0912-0309 - - EC300 02-19 71.95 Cast Replica 0910-3186 0912-0177 0913-0038 0913-0056 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 pistons 0910-4669 0910-4658 0910-5178 1186
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