Quote from Dell: Heres how I recommend adjusting the simple carb. Both Ford and Marvel/Schembler say to adjust BOTH the side-pointing idlemix and the down-pointing mainjet to 1-turn as a starting point. I set the down-pointing MAINJET to 1-1/2 turns and LEAVIT!!! On a warmed up engine, I then adjust the side-pointing idlemix to maximum idle rpms, NOT SMOOTHEST idle, maximum idle rpms. Understand? I then adjust the behind the carb throttle screw for a SLOOOooow 400-rpms idle. (ennythang under 500 is probably good) I do that song-n-dance at least 3-times before I"m satisfied. It should smoothly increase as you increase the throttle. A quick pull from 1/4-throttle to MAX should go fast without black smoke. Remember, the side-pointing idlemix is BASSACKWARDS. out for lean, IN for enrich. My side-pointing idlemix is usually about 3/8-turn. Your carb is different than mine, so your final settings will be different but the proceedure is the same. Understand?..... ....Dell You may also have a partially blocked fuel filter/screen too. Have you checked them yet?
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