My G26 quits when i roll inverted at high throttle settings. Ive had this problem since i first ran the engine. For peak RPM i leaned the engine almost 2 full turns. At this setting the engine doesn't stop while inverted but runs different. Is there something that i am overlooking. Ive cleaned the carb numerous times and experiemented with many needle settings.

If you post this in the engines/gas forum you will get a better response.

My guess is to take a look at the tank and make sure that your clunk is not stuck

Good guess Mike, could be jammed at end.