Ok, that sound like High end too rich and low end too lean? I leaned out the high end about 1/16 turn the other day and it ran ok. It runs really good at just above idle i.e. in a harrier or elevator so Im afraid to mess with the low end needle adjustment. Im pretty new to gas engines.

Do you guys also get a misting of a heavy black "tar like" smut on your plane after a flight? I get it on mine after each flight. It comes off but it is REAL thick stuff and mostly on the right side (left wing)