RE: rich or lean gas?
hello tiktock Have had this problem several times over the last 25 yrs, flying giant scale planes. This problem happens in the air because, when airborn. the air pressure around the carb fuel metering diaphram is not letting it do the metering job correctly. to solve this problem, I suggest soldering a length of 1/8 inch brass, or copper tubing to the center hole on the dia. cover. Then run a piece of fuel line to the rear of the carb. I usually run the tubing back of the firewall into neutral air. This has cured the problem every time. Also, if there are any holes around the metering plate, just solder them shut. If there is no hole in the center of the plate, drill one to fit the 1/8 tubing. Hope this helps, please let me know. Regards jack