I had a miss in a Cockshutt 80 that I worked on for about 3 years. The engine ran ok under load, but at idle or no load there was a miss. I changed out the mag to a distributor and the miss was gone. I never suspected the mag because the tractor started good and there was a nice blue spark from the mag. The problem was in the impluse. It was really dirty and one coil on the spring was broken. I thimk the problems in the impluse caused the engine to get out of time. No bad enough for it not to run, but enough to develop a miss. I think the H4 mag is a good mag. it just might need some tlc. Good luck
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