When I restore my tractors, either it be a regular, f30, or f-12, I first pull the spark plugs, squirt in some oil, short the plug wires to the block and then belt up and run the engine for 10-15 minutes. I watch oil pressure, to make sure its up there. This way I pre-break in the engine without it under load.
After it is nice and free, I then install the plugs, add gas, and crank it over. Generally, they start right off.
IN my opinion, the E4A is a hotter spark than the F4. Either Mag is a great mag when they are in good working condiditon and set-up right. Take some old plugs, gap them out to 1/8", and test the spark jump. If they all fire, then the mag has enough power.
Make sure the mag is timed right. I set the advance in the middle, and adjust the mag coupler so the the mag fires (under the impusle trip) when the piston is just past top dead center. The engine starts easier, and I never have a kickback.
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