The Eco version of Naraku Antriebskits consists of clutch, clutch bell and variator. Installation ready! All components are carefully matched to each other. All reactors in the unit are therefore canceled. Not only does it increase top speed, but also the start-up behavior on the mountain. The kit includes variator, Vario sleeve, variator rollers, clutch and clutch bell. Suitable for all 4 stroke engine of the 139QMB scooter. The kit is designed for scooters that are in original condition, changes should have already done to the exhaust or the cylinder can be done the variator must be retuned and possibly a more difficult back pressure spring to fit.