1bruno

Thanks, First the prop is a Zoar 18 x 6, and balanced.
Second the gas is good and the oil is Amsoil synthetic. Mix ratio is 40/1
Third, The muffler is standard.
Forth, the motor is broken in.
Right out of the box I never got the engine over 7500 RPMs.
So should I close the high and low ends and open up as the manual says and use that as the starting point? Sounds like I need t adjust the low end then the high end.
Before I go buy a new prop ill try to adjust everybody tells me that I have the correct prop.
Could I be running the wrong gas to oil mixture? Its spitting out alot ot black oil on the plane thats for sure.....
glen