Yes; if you only need to raise the idle, just loosen the screw that holds the plate into the bottom of the seat bucket, flip it back, and grab the thumbwheel and (while engine is running), crank it a little bit clockwise. Of course you don't need a tach, but resist the urge to set the idle too high. When the engine's warmed up, you don't want the back wheel to turn at idle; that'd be too high, but stalling or running rough would be too low, of course.
If you can't get a happy medium there, you might ask a mechanic to look for other issues.
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