Hi suzonka
I have been flying a Canard I designed for about 4 years. For anyone to help you we need more information about your plane. What are the various specs, including weight, wing span, chord, etc? Generally, a pusher engine cannot cool itself while on the ground. I get into the air withing 30 seconds of engine start. If more time is needed to tune the engine I replace the prop with an identical tractor prop and tune all I want. What is the location, vertical and horizontal, of your fuel tank relative to the carburator valve?