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I've learned a lot from the sources suggested by you all. Thanks again. I turned the jets down on the middle carb to a very lean setting and cleaned the spark plugs. Drove about a mile to the store, returned home and removed a plug. Found it to be completely black with carbon (after 1 mile!). Would there be any advantage to disconnecting the two dumper carbs and just work with the middle one until I get the thing running right and then reconnect the dumpers? Sorry for my ignorance but this is my first three carb setup.