Fuel: Cool Power 20% Nitro 20% Oil. My other YS runs perfect on the fuel. The engine does not run hot it has a problem transitioning from idle to full throttle after the first flight on the ground. It sounds like it is rich not lean in the transition i.e. it loads up. Once your in the air the enigine runs fine doesn't die but when you land and taxi back it loads up at idle and dies rich. I have adjusted the pump as lean as it can be for the engine to run but it still loads up at idle on the ground, when it idles for an exteanded period of time.

Matt