Cylinder 72Cc Gy6 Qmb 139

CYLINDER 72CC GY6 QMB 139 – fits -> See Vehicle Fitment Tab

Torque-strength 72cc sport cylinder kit for 50cc GY6 and Kymco 4 stroke engines

This cylinder kit is not designed for high engine speeds, its strengths lie in the lower speed range.
Shortly above the idle speed, a constant and very good acceleration follows without loading the engine with unnecessarily high engine speeds.

The kit comes complete with all parts and gaskets. The original cylinder head is still used

The kit can be operated with the original carburettor, but we recommend the adjustment of the main nozzle.

The bore corresponds to 47mm, which corresponds to an exact cubic capacity of 72cc.
Often these 47mm kits are also referred to as 80cc cylinders, because in Asia the scooters with 47mm cylinders were also sold as 80cc scooters.

From engine development, 47mm cylinders is actually the original cylinder for QMB / QMA engines.
In order to be able to offer suitable vehicles in Europe for the driving license regulations, the scooters are equipped with 39mm cylinders by the manufacturers and thus have 49ccm.