This is my first gas engine and first flight on it. I started it and ran 3 tanks of gas through it on the ground. It ran great I never mover the needles from where they were. Today when i i went to fly it. It ran great but sagged alittle on verticals and inverted flight. After about 4 min. It lost alot of rpm, I could not even hold alt. I landed the engine was very warm. Not knowing alot about gas engines I am wondering if it is overheating, or maybe it is an airflow problem to the carb(the carb is all inside the cowel) or is the mixture just not set right.
Thanks for the help
Bill