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When Bendix went to the bakelite cover they also put two spring loaded tensioners together on one side in a short period of running the crankcase would get out of round and the .003 clearance would be exceeded and no spark you could have it at WOT and idle but not I’n between or vise versa If you read the set up in the repair manual it discusses the requirement for the clearance and if you have one like this you can measure the clearance and change the throttle setting and if its worn the setting will change also. The points were supposedly platinum so unless rusted springs or worn out clean them and good to go The phelon mag plate flywheel and breaker cam will fix the problem as its tolerance is much greater