I have a Rossi 61DF engine that is about 10 years old. I am having trouble setting it back up. It will start, idle and run up to about half throttle. If I go higher, it stalls. The carb has 2 needle valves, 1 one the side where the fuel line is connected and 1 on the other side where you connect the linkage. When the fan is out of the plane, it runs great, as soon as I put the fan back in the plane, I have the trouble. I am using a header tank.

Anyone know the basic needle valve settings for this engine?