Originally Posted by dparker
I'm just guessing but I'd say your butterflies maybe rubbing. I've fixed that by loosing the screws on the thottle shaft and then gently open and close the throttle until the butterflies are free, then retighen the screws.
X2..just don't take the screws all the way out they are smooged over on the ends to keep them from backing out.
Also I would still adjust the speed screw back down until it at least touches.