This is old school, you need to check and make certain your magneto armature is still magnetized. See if a Steele object will stick to it. If not it wont ever generate enough magnetism to cause a spark. You can re-magnetize it by applying DC 12 volt current thru the field sides for about 60 seconds. Once engine is running the rotation of the armature will fully re-magnetize its self. Since your system combines charging, spark timing and ignition pulse to the coils it has a lot of demand on it. Setting for a long time will cause this condition or something like hooking the battery up backwards for a split second can de-magnetize it. 70 years ago this was a common problem with cars, trucks, boats and motor cycles.
I’m happy to help further over the phone at https://www.6ya.com/expert/david_c087e4b7d13c0163
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