I am not familiar with the farmall cub. Maybe the magneto turns opposite of the A, B , C H & M. But the A mag turns clockwise when facing the impulse,(magneto in your hands in other words) so , you push magneto toward engine block, turn engine to just a few degrees after top dead center, never top dead or before, then pull mag toward you until it trips. like I said before, often times the wear in magneto will let it trip before it is supposed to, so that is why I said to turn it several times with switch off while checking for that early trip. It may not trip at all if worn enough. I repaired a quite a few of those mags and the tips of the weights wear, the roller they strike to hold the windupl mechanism wears as does the pivots of the weights. All of these can cause the problem he is having with kicking. That mag has a 35 degree spark lag with impulse so if the impulse does not engage you will get a spark,(although very weak) at any where from trip set to that 35 degrees before. Major kick back. Reason I said to take plugs out is so for easier observation from easy turning and you will also not be sucking gasoline into the engine. The other timing is rotor to cap and has nothing to do with when the spark occurs, just so rotor crosses the contact in dist cap at the proper time to transfer spark from rotor to cap. Also, a magneto like this is also a distributor. So many guys call battery ignition systems distributors. ?Well, with a multi cylinder engine you have to DISTRIBUTE the spark weather you have a magneto or battery ignition system, so, they each have a distributor.
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