Originally posted by 71Demon
Sounds like it. The Power Valve is dumping in to much fuel, and your using the idle screw to lean it out. Your only slightly out of range, so the power valve is close to being the right size.

Now did the RPM's peak as I explained at that setting, and fall off either side of it. Could you stall the motor by running them all the way in?
Yes the RPMs peak and then fall off on the extremes. The motor did stall by closing alll the way.