We just got the engine on our 2n freed up a few days ago.Hooked up a 6 volt battery that was pretty well charged up and it rolls over fairly slowly mind you but it does roll over.Dad suggested unhooking the live and boosting it with 12 volt directly to the starter but I dissagreed so we left it for now.Is that a safe practice for the starter's sake?I figured if it was double the voltage it was intended for it probbably wouldn't help it any.We used pennetrating fluid in the plug holes and gently rocked it in gear back and forth to get it to let go,should we also let it soak in diesel for abit to help clean it up inside to make it turn over more freely?Is it actually safe to boost it with 12 volt?Thanks pd.