Guest snownman Posted October 23, 2017 Report Share Posted October 23, 2017 I am building a 421 cub with cpi out of frames, 21 cc domes, dyna ignition, and 35.5 mikuni t-slides and im looking for a starting point for main jets. i am using a 55 pilot and the cel needles. elevation about 4500 feet Quote Link to comment Share on other sites More sharing options...
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