Hmm. Looks like a good thing to do with my 10 HP horizontal shaft Tecumseh. The 120 volt AC generator head attached to it really sucks. It starts out just fine with 125 volts AC output but within a few minutes the voltage drops to about 85 volts, whether it is electrically loaded or not. The output frequency stays at 60 HZ so the engine is doing its part in keeping the proper speed. Good engine, junk generator head. Replacement generator heads can be had, but none that will match up to a Tecumseh engine because it was the only one manufactured with a tapered shaft. No current replacement generator heads are made to this non-standard configuration.