well guys, on the magnet strength question, the impact of a weak magnet is a weak spark at low RPM's. I have a magnet charger, but not sure where you are located. I am in western PA and would be happy to charge it for you. for an F4 magnet, it should be able to hold its own weight when placed sideways on a piece of steel or similar. If it won't hold its own weight, it could use a charge.
To make a point, I had the original mag on my F12. would NOT start with the crank, but would fire up and run if pull started. Recharged the magnet, and she starts up fine with the crank. More magnetism, hotter spark at low RPMs.
as far as what symptoms you are experiencing, on the F4, make sure the distributor disk is clean. Make sure all carbon brushes are moving and not "sticky". Make sure there is continuity through the transfer post from the 2ndary on the coil to the cap. Lastly, make sure the safety gap is not closed up. If I remember correctly, the safety gap should be around 7/32 + not -. I'll get the manual out and double check.
A clean and correctly set F4 mag, with a fully charged magnet will throw a "knock you on your butt" spark with just the impulse......don't ask me how I know...........
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