I'm NOT a mechanic... but in my experience on an air cooled engine overheating is caused by either lack of lubriciation, lean air/fuel condition, or timing too far advanced. So if I were you I would: 1) ensure you have oil pressure/ proper level 2) check timing (if it's got points timing may be adjustable) 3) clean tank, filter, petcock, and carbs ( see if it overheats when you ride with the choke partially on seems like a decent test for lean condition)
But that is just me, Dennis I'm sure could offer better advise if you give him some specifics.
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