Also trying to put together an ev-go-kart based on a full size chassis, ex-shifter. Have the ME0909 motor, 48 v controller Sevcon, batteries lead acid 4 X 12v 50ah. The motor sprocket has 16 teeth, I want low end acceleration vs top end speed. Which sprocket size for the shaft? for a 1 to 3 ratio. What are the parts I need to connect the sprocket to the shaft? Thank you, Nick