I have been having problems with two 2 year old OS 46 AX engines. The first one will run until I give it three to four clicks up on throttle. Then it completely quits on me. The second one was in the air when I slowly began to lose power. I was at full throttle and I was only getting about a 1/4 of the power. I have changed glow plugs, tried setting the needle valve thinking it may be running rich or lean, and even tried different fuel. Nothing seems to make a difference. I have posted pictures of the engine that was flying at the time of losing power. Has anyone seen this and/or are there any ideas as to what may be causing my problems?