This kit includes a 250w brushless motor, mounting bracket, control unit rated to the motor,
chain and rear sprocket. The parts are a direct fit to the revvi 16" bike. The kit increases the
acceleration and torque of the bike. This motor is also more efficient then the standard
16" motor so your battery should run for longer. 
 
You can choose from 2 sprocket sizes on the motor: 
 
13T - More acceleration less top speed
15T - Less acceleration more top speed
 
You can choose from 2 control units: 
 
Standard - Fitted to the bikes in production. 
Fast Start - This control unit is an upgrade for the standard 16" Plus standard control unit,
once fitted the power delivery is much quicker. The top speed is the same but the bike
accelerates much faster.