Hi: Looking for some help,I have a jd hydro 175 with a kaw fc420v ohv engine.Its getting fuel,But seems to get spark only when it wants, when it does its very week.This is a friends machine he sez it was running fine till he switched the blades on(blades are electric clutch),Then sputtered a little then died.any one have some help than can give would be great. Thanks don