On the 6hp there is just one which adjusts the mixture. Pull the knob off adjust the mixture using a scewdriver then refit knob it its central position.
Can't you get some idea what they are connected to by taking the cover off and having a look.
Slow speed (idle) mixture and high speed (full throttle) mixture. or at least they were on my old 25 - made it easy to tune the carb after a carb cleaning / rebuild and to compensate for partially blocked filters. /forums/images/graemlins/crazy.gif
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