I have an e-max scooter (30 mile range, max speed 30mph). I'm not sure if that qualifies as a large or small scooter? Anyway - when I switch it on it tries to zoom off at max speed. I assume the potentiometer throttle (?) has been mis-wired. Any tips from members? I am quite comfortable reading circuit diagrams for old valve hi-fi but I could do with help on this.