Hi Bill
I once owned one of these beasties.It may not be yur answer to your problem but the previous owner told me the exhaust valve clearances were a cause of overheating(in his experience I add).
I made it a part of my maint to adjust them every 4 or 6 months.They are hiding in that rocker cover on the side of the motor!!!!!!! The inlets are up in the head where they belong!!!!!!!
Andrew


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