super trans kit -NARAKU- 788mm for 4-stroke 50cc 139QMB

not only the top speed, but also the starting behavior on the hill.

The kit includes variator, vario sleeve, variator pulleys, V-belt, V-belt pulley, clutch & clutch bell. Suitable for all 4-stroke scooters with 139QMB engine and a V-belt length of 788mm.
The kit is designed for scooters that are in original condition, if changes have already been made to the exhaust or cylinder, the variator must be retuned and if necessary a harder back pressure spring must be fitted._{AI-translation}