Can you post or send me a picture(s) of the exhaust system?
My Dad tried to run a straight on his narrow front Cub. The Cub had a cap with holes drilled in the cap to help quiet the engine in the middle of the exhaust system. He had some overheating problems and it took longer for the engine to speed up.
He removed the cap and installed a muffler from a Farmall Cub and the motor has been running good since them.
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