The Polini Final Drive Kit for Zuma 50cc will give you a higher top speed while decreasing your RPM under cruising conditions. High powered Zuma's tends to overheat and self-destruct on long rides. The Zuma Gears from Polini will help reduce the stress and wear and tear on your Yamaha Zuma Motor. -Lower RPM = Less stress under cruising conditions -Straight Cut Gears -Reduce Friction = Free HP -Increase top speed