Well I got it fired, but the tank is really vibrating, I'm doing as the manual says, start at 1/4 throtle warm up to 1/2 then run at 4/4 throtle for ten min. 1/4 and 1/2 are fine but when I get to 4/4 throtle the tank is vibrating so much it gets alot of air in the line. I balanced the prop and spinner, what else can I do?