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I have a 41 flat8 and left the key on for a few days...recharged the battery now no fire...cranks fine and powerfully but no spark...new to flatties and not sure if I burnt something...points? coil? what do I look for?
pull the cap and have someone spin the motor for you and see whats going on. I had the same problem and the ground wire in the distributer had a bad connection.
Check the wire from the points that goes to that stud throught the side of the housing. Mine had a plastic washer to keep the primary wire from grounding out, it had cracked from age and grounded out.