Posted by Dean on December 05, 2019 at 12:57:37 from (68.39.250.176):
In Reply to: Wico A series magneto posted by JerryCPP(WA) on December 05, 2019 at 12:13:18:
I once had an AC WC with FM magneto that became difficult to crank start after the impulse stopped working.
Upon inspection, I found that heat had caused tar in the winding to flow onto the armature making it difficult to turn. The shaft would turn the armature and the impulse would wind up but the spring was not strong to spin the armature upon release. Result: Engine runs and starts OK with starter but difficult to start with hand crank. There was also no clicking of the impulse upon cranking or shut down.
The tractor had been sitting in the barn for years in a position where sunlight passed through a window and shined onto the magneto.
A couple of hours cleaning out the tar with gasoline, etc., solved the problem.
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