Re: Pulling trailer against the wind overheating??
It very well could be from a leaky gasket. A leak like that can cause excess noise as well as a loss of power.
you can use ultra copper gasket maker to help the base gasket make a good seal. A thin coat on each side of the base gasket will do the trick.
The cylinder head and cylinder should be lapped on a sheet of sandpaper to ensure that the surfaces are flat. And again, use ultra copper gasket maker on each side of the head gasket. Use the same thin coat as you used on the base gasket.
66cc HT on vintage cruiser frame.
Micargi Rover with 79cc HF. The new project!