NEXT-question is i bought used JR RACING AM radio put receiver that came with radio in slider -hooked up battery steering is perfect but throttle is backwards-can't figure out to make stupid thing to spin the wheels in the right direction-probably could resolder wires on motor and make pos to neg-etc but i don't know if it hurts these motors (stock slider) or if the motor doesn't now which direction it is turning-darn think has a screen on it but with no direction -it is tough-i did look all over this thing to see if it had a rev. switch for thr.& steer. but couldn't find any-any body know how to rev. her--thanks rich