When I've seen gas vapor coming out the carb it usually means the intake valve isn't sealing. Intakes usually don't burn, they go out of adjustment or in this case perhaps dirt is holding it open. I think your engine is overhead valve.
It doesn't seem right that your engine will idle, and not come up to full speed. Do you have a high speed adjustment on the carb? Was your old spark plug black. If so that would indicate a rich fuel mix.
I haven't had much luck with spraying carb cleaners. If nothing else, use compressed air to clean the jets. I've had some success with removing the adjusting screws and blowing air in them and not even taking the carb apart. Just give them a good puff.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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