PROVIDED your carb is original, the Super M carb main jet is supposed to be adjusted about 3-5 turns out. The 5 turns will be too rich for all but maximum loads. Adjust it out until it does not stumble under load. This is probably about 3-3.5 turns off the seat. If this does not work, your carb needs cleaning. The main jet on the M carb is adjusted in until rough, out until smooth plus maybe 1/4 turn more -- This results in too lean a mixture for a SM carb, and is perhaps the reason some adjust between rich enough to smoke and lean enough to stumble (some call it the "sweet spot" -- I don't do it that way.
This post was edited by CNKS at 14:53:40 04/06/09.
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