Thepenguinsays Sorry I had to run last night before I could answer. Some times if the glow plug doesn't get enough fire or goes bad the engine will flood and cause what they call a hydrolic problem that almost freezes the engine until some one removes the fuel from the piston chamber or it dries out. Best way to check for the problem is remove the glow plug and see if the engine turns over then. It does not take much to burn out a motor. that is one of the biggest draw backs of the system. Thats why almost everyone that is deap off into RC cars etc, use a bump box rather than even a pull start. Myself I like the roto start, thats a lazy mans starter..........lol good luck with your problem and Oh if after you pull the glow plug it doesn't turn over but the motor will spin, don't mess with it just replace the whole starter assembly. You won't need the hand unit. And make sure the clip that holds the wire onto the glow plug is good and tight