I have a 50sx. It seams to have been run lean a couple of times because i noticed the oil from my Cool power 15% to be a darker cooler than normal. I watched the line from the remote needle to the carb the other day and saw air entering. I'm about 3 1/2 turns out @ 40F and 500 PA. I'm new to airplanes and have set the needles and pointed the airplane up at high RPM to check the mixture. No drop or increase in RPM. But when I landed, I noticed the oil color. Running a 12x7 Prop on Sig LT-40.

Any input would be appreciated.