Posted by RichH on December 30, 2007 at 15:35:59 from (98.132.227.81):
In Reply to: this odd old 40 A posted by tn terry t on December 29, 2007 at 11:27:55:
In my training as a mechanic back in the 70's, this is how I was told a mag works. First the mag creates its own power to create the spark at the plugs, it has no connection to the battery. When you stop a tractor with a mag you ground out that power and the spark is not created and the tractor stops. The impulse is what creates that power. At a very slow rpm like cranking at the proper time the impulse drive snaps and spins the mags armature a few degrees very quickly to create the electrical power that goes to the coil in the mag and when the properly adjusted points open up it creates the power to make a spark at the spark plug. Most old tractors the mag had adjustable timimg so that when you were cranking and the mag snaped it was when the piston was past top dead center and the engine wouldn't backfire and maybe break your arm or other things, then when the tractor was running the timing was changed back to the preset advance for more power. When the tractor is running the armature is spinning fast enough to create the spark without the impulse snapping. So spinning the engine faster at starting should not be causing the problem, except that if the engine is easily flooded it will flood that much easier. Try starting it first with no choke and after a few seconds if it doesn't start then choke it just a very little and if it still floods you might have other problems like too high gas level in the carb. I have a tractor that I can't pull the choke until it starts and then I have to pull the choke some to keep it running unless it's really cold then I might have to choke it just a little to get it started. I hope this helps. RichH
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