I am having a small problem with a q-40 going lean durring a run. Lets assume that the needle is not moving and there are no holes in the tank or lines, and I am using a tetra 6oz bladder tank....what could it be? It kinda reminds me of a sport plane, not going super lean, but i have to start out too rich in order to finish the run at the proper rpm. Any comments would be appreciated and I thank you in advance.

Jeff Burg