The GY6 engine design is a four-stroke single-cylinder in a near-horizontal orientation that is used on a number of small motorcycles or scooters made in Taiwan, China, and other southeast Asian countries.
Apparently, vehicles of this model were imported from Taiwan by various manufacturers and traders, and spread mainly in the southern coastal regions of China.
Fuel metering is by a single constant-velocity style sidedraft carburetor,[2] typically a Keihin CVK clone or similar.
[2] It includes an integrated swingarm, which houses a centrifugally-controlled continuously variable transmission (CVT) using a rubber belt sometimes called a VDP.
At the rear of the swingarm, a centrifugal clutch connects the transmission to a simple integral gear-reduction unit.