Thanks for the response Chris. My idea was to get the engine running using a modern carb and then implement Henry's original design. Sounds like the carb was just too big for the engine. Sizing a carb can be tricky, too big and it will run too rich. Too small and it will run too lean which can cause it too run too hot. I've actually got a small carb from an old 5HP Briggs and Stratton I'll probably try first. No need to spend time sending me the part number. Would be nice to see another video when you get time. Thanks again.