Will the warmed up engine crank if you use a 12V boost? It sounds like something might be binding up inside the engine like pistons fitted too closely the the cylinders. Is the engine freshly rebuilt, or does it have some miles on it?
I never thought to use 12v on my 6v. Engine will not restart whether cold or warm. I have yet to test voltage on battery under certain conditions...cold as (
won't let me use the word) here right now. The battery is new from Farm and Fleet and, yes, I know from past posts, new doesn't necessary mean good. I thought about getting a load test on battery. I use a trickle charger for about a day or so on battery to full, start truck, shut down truck, no restart, and repeat trickle charge for a day or so. The engine is definitely not a fresh rebuild. I bought it from Shwanke Engines in Minnesota. The owner had a customer who wanted to replace the engine. Customer stated he recalled that his father had the valves ground at some point. Shwanke will test run the engine and send a video of it running. The only difference is that the engine came with 12v starter and generator. I am keeping 6v. I swapped my rebuilt 6v starter and generator...and yes, Pertronix ignition for 6v system that some people hate. There are posts referring to the flywheel number of teeth. It looks to me that the gear on 6v starter and 12v are the same, besides, engine cranks fairly well initially (but not fast like a 12v).
