I have been working on an American Bosch FB1ED1 mag that I was going to try on my 10 HP Novo. I think the mag that shoul d be on it is a DU1. The FB1 is a mag that apparently was used on a marine engine and has a lever that changes point opening timing. I have great spark when the impulse trips and you can spin it by hand and also get good spark. When I put it on the engine, I only get spark when the impulse trips. I can't spin the engine fast enough to get the mag to spark without the impulse tripping. I know that the engine will run faster than I can crank it but I do have it set up to run slowly. Is it possible that this mag will not produce spark at the slow speed of a hit miss engine?