Through years of trials we’ve found this to be a highly rewarding upgrade. Great for riders in higher speed zones and the bonus is there is no additional load to the engine. The Malossi Gear up kit fits all SYM Jet scooters, Including Jet4R, JetsportX, Red Devil, Blue Devil and Jet Basix.
The gears replace 2 of the factory gears in the the differential to reduce the overall gear ratio. The end result is a higher top speed and without modifying any internal parts of the engine. Tooth count 15/44.