I have a nitro evader, with a horzins cooling head. After about 1 min of use(doesnt matter the rpm) it shuts off. It has fuel in the line and in the tank, clean air filter everything seems to be right. The only thing that i could see wrong , is the gas tank has a slow leek. I dont know if that matters thought. It also doesn't run that well if i lean it out or richen it up. I also shortened the fuel line, and it doesnt matter. My ignitor is charged and everything is right(I think)!!!!!!!!! THanks