With the four-wheeler in neutral, start the vehicle. You will know the four-wheeler is in neutral when the vehicle can be pushed forward or backward without engaging the transmission.
Locate the clutch on the left side of the handlebars. Squeeze the clutch handle against the grip of the handlebar. In this position you can engage the gear drive by pushing down on the shifter pedal.
Slowly let the clutch handle out as you apply pressure to the thumb throttle on the right side of the handlebar. Once the bike starts to move, give it a little more gas and keep letting the clutch out until the bike is on its way.
Shift gears by letting off of the thumb throttle and pulling the clutch handle in. Place the bike into second gear via the gearshift pedal and then slowly let go of the clutch as you start to apply gas via the thumb throttle. The same method is used for shifting into higher gears.
Remove your thumb from the thumb throttle and pull the clutch handle in. Downshift the four-wheeler by putting it in a lower gear. Slowly release the clutch. Do not apply gas until the clutch has been fully released. This will prevent the bike from over-revving and potentially causing an accident.