I took out my trainer today with a OS .46ax with a 11-6 prop and was flying around just fine. I throttle back to 1/4 to do some slow flight. After a couple of circles around the pattern i throttled up to pick up speed. It sputtered and the engine died. I dead sticked it in ok. I started the engine back up and noticed that at 1/4 throttle(5000 rpm) the engine sorta boggs down and sounds rough. I could not get it to die again but it just is running odd. I idles ok at 3400rpm and revs to a max of 12400rpm. Is there some kind of midrange adjustment that can help?

skeeter