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GY6 180cc 63mm Big Bore Upgrade Long Case

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GY6 180cc complete power kit



If a GY6 125cc or a 150cc motor swap still isn't enough for you, then you need to get the GY6 180cc 63mm Big Bore upgrade for your swap. Complete with machined crankcase this is the easiest way to upgrade the GY6 from a 125cc or 150cc to an 180cc displacement. Thus giving a higher top speed and much better acceleration. The kit includes all parts necessary to install. No further machining is needed.

Additional Info

Additional Info



  • GY6 125 and 150cc Engine
  • GY6 QMI/QMJ 152/157

GY6 Big Bore Kit:

  • 63mm Cylinder (57mm Stud)
  • Super Two Valve Big Port Head
  • Machined Left Crankcase (drum brake only)
  • Machined Right Crankcase
  • Piston, Rings, Pin, Clip
  • Camshaft
  • Rocker Arm
  • Rocker Arm Seat
  • Head Stud
  • New Gasket
Brand Other


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