ElectricScooterParts.com Support Center

That could be caused by the sprocket size creating too high of a gear ratio. We can run some calculations to help determine what the right sprocket size should be. To do this we will need to know what the diameter of the rear wheel is?

With 16" wheels and a 44 tooth axle sprocket, the gear ratio is for a 35.82 MPH top speed which is too high for a 1000 Watt motor.

A better gear ratio would provide a top speed of around 25 MPH if the go-kart will be used on flat ground only, or of around 20 MPH if the go-kart will be used to go up gentle hills, or of around 15 MPH or lower if it will be used to go up moderate hills. 

A 72 tooth axle sprocket will change the gear ratio to a 21.87 MPH top speed as shown in the calculation below.

We also carry a 10 tooth motor sprocket that would reduce the gear ratio by another 10% and get the top speed down to 19.9 MPH with a 72 tooth axle sprocket.

The lower the gear ratio is the better the go-kart's hill climbing ability will be.

We do not know how steep the hills are or how much the go-kart weights, so these gear ratio recommendations are estimates only and the final determination for the correct gear ratio will need to be made after the gear ratio has been changed and the go-kart is tested under the conditions that it will be used in.