i have a g2300 with about 200 flights on it. it has alway's given mixture problems ot varius rpm's and found that could not get it rich enough on high end. keep backing mixture screw out and when it hits high rev'e extra turns did nothing could not evan get 50 rpm drop. so I drillied out the high rpm jet and it made all the difference in the settings and performance
now runs great, i fly at 2300 ft above sea level.