It could be rust or dirt that's not allowing the snapping action on the impulse when cranking. It could be the the spring is broken or where the fingers contact the posts are worn not allowing the impulse coupling to "windup" to get the snapping action with the hot spark when cranking.
If you ever decide to pull the mag you need to pull the cap and see where your rotor is pointing and make a sketch. Once you pull the mag don't ROTATE the engine. When the mag is repaired you rotate the rotor shown in your sketch and install the mag and your engine should start. The same applies to a distributor.
You should contact 'Jon the Magman' at www.farmallall.com and ask him his opinion since he rebuilds these mags. Hal
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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