I notice that you say you are getting 11K+ with 15% on a 12-6 APC prop. The ads all say that the engine is supposed to turn 12k with that prop. I am using 10% Sport fuel annd I am getting about 11.3 to 11.5 k whcih isn't bad but not quite as advertised. I did change the low needle setting. With the throttle at idle setting the engine was spitting fuel out of the top of the carb and revving quite high. When I opened the throttle the engine would instantly flood and die. I had to close it down in order to get it to run half decent. I have 3 other planes that need sorting out right now and I will get back to it later and try again. [>:]