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GY6 49cc to 100cc 50mm Big Bore Cylinder Kit with Cylinder Head Assy for 139QMB 139QMA Scooter Moped ATV Engine (69mm Valve Length)

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$51.99

$ 23 .99 $23.99

In Stock
  • Inner Diameter of Cylinder Sleeve: 50mm
  • Outer Diameter of Piston Pin: 13mm
  • This a Non EGR Cylinder Head, Does Not Have the EGR Port
  • Valve Length-64mm, Intake Valve Diameter- 18.5mm, Exhaust Valve Diameter-16mm
  • High Performance Upgrade 50mm Rebuild Kit for 139QMB 139QMA Engine


Big Bore Kit Includes:

Cylinder Head Assy with 69mm Valves (Already Installed)

100cc 50mm Cylinder Block

100cc 50mm Piston Set (Piston,Piston Rings,Piston Pin,Piston Pin Clips)

Valve Oil Seals

Gasket Set (Head and Base Gaskets ,Tensioner Gasket ,Exhaust Gasket)

Studs Set (Intake Studs, Exhaust Studs,Exhaust Nut )

You will also get an extra BACKUP Kit include the gasket set and stud set.


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