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The procedure to adjust idle is...

turn the pilot screw out 2 3/4 turns from being seated

adjust idle speed with the throttle stop screw (big knob on the bottom right side) to 1400 +-100rpm

adjust pilot screw to obtain the highest rpm's (in/out)

readjust the idle speed w/ throttle stop screw

turn pilot screw in until 50 rpm's drop

readjust idle w/ throttle stop screw.

This is from the Honda manual.

If you don't have the idle set correctly, that could be the problem. You'll need a tachometer, that is unless your ear is perfectly calibrated. Mine isn't. Hope this helps Mark.
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