I know the thread is a little old but your subject said flywheel touching lighting coils and you were having top end misfire problem. Might be 2 different problems since lighting coils are not in the ignition circuit. As far as contact with lighting coils, if the contact was the edge of coils (opposite side from engine) maybe the main insert install/machining moved center of crank slightly to the clutch side, or maybe flywheel rivets were not tight if it was welded which could move the magneto part of flywheel a little. Many of the posts are left where they are once the person fixes the problem and I can relate to that, "let's go riding".... but the dude wanting to ride but is broke thinks "dang.... wonder if that fixed it? I want to go riding!" Just a thought.