How involved is it to exchange a motor on a walk behind that's a belt drive? In this case, a Briggs motor. if i replaced it with another briggs, the similar HP, are they all basically the same mount specs, or do you have to drill out? and removing the pulley's underneath, I've never done anything like that. are they a pain in the butt to get off? ANd on a wb with no safety shut off on the handles, there shouldn't be any electrical to hook up, just the throttle. this is a 32" kees. I'm rebuilding the carb now, and if it doesn't work, i'm throwing thre motor in the garbage and getting a new one. saw one on eabay today, brand new 10.5 hp, $305 with $50 delivery!