50cc 39mm Cylinder Kit – GY6 / Kymco 4-Stroke – 13mm Pin

This 50cc 39mm cylinder kit is a high-quality standard replacement for GY6 50cc 4-stroke (139QMA / 139QMB) and Kymco 50cc 4-stroke engines. Ideal for replacing a worn or damaged original cylinder.

With a 39 mm bore, the cylinder maintains the original 50cc displacement and factory performance. It fits directly onto the original crankshaft and is suitable for everyday use.

Equipped with a 13 mm wrist pin.

Technical specifications:

• Type: 50cc / 39mm
• Cooling: Air cooled (AC)
• Wrist pin: 13 mm
• Engine: 4-stroke
• Engine type: GY6 139QMA / 139QMB
• Tuning level: Standard / OEM replacement

Supplied including:

• 39mm cylinder
• Piston
• Piston rings
• 13mm wrist pin
• Piston clips

Note: Supplied without gasket set. Order separately.

Gasket set:

Standard GY6 4-Stroke Gasket Set

Spare parts:

39mm piston:

GY6 / Kymco 4T 39mm Piston

Also known as GY6 50cc 39mm cylinder, 139QMA cylinder kit or Kymco 50cc 4-stroke replacement cylinder 13mm pin.