This camshaft has more lift and more duration than the stock camshaft to make more power in the effective RPM range that the Ruckus/Metropolitan engines prefer. More fuel/air mixture to be burned and more exhaust flowing out equals more power. If you are trying to extract every last bit of power from your scooter you will need one of these to do it. This item (as well as any other camshaft) will require the adjustment of the valves to the correct tolerances.
Installation by a mechanic is recommended.