I have an inverted saito 100 in a hanger 9 p51. The tank center line is just above the carb. The issue I am having is after running a 1/2 tank of fuel the engine loses power. When the engine is shut off (or dies) it is found to have very little if any compression. The high end needle is set so that a good smoke trail follows the plane. It is getting hot but I dont understand how it could be lean with a good smoke trail. The low end maybe a little lean as to idle good but when the plane is in the air I might get 1 good flight and the on the second flight the engine does not seem to have the power it should. (15% wildcat fuel 14x8 prop)