Depends on what magneto. The H 4 used on so many IH tractors wear out the impulse weights and pins and spring gets weak. That makes for poor starting but does not affect running. Should have special magneto grease to repack the bearings also but can get by without. The rotor drive gears and hub get loose but they are available at some after market places. Not so much for impulse parts though.
I used to have a box full of old magnetos at the dealer when they were replaced with battery ignition units and I was always digging in there for the least worn parts to get a magneto going for a customer.
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