ASP3D: I went out this am about 1000 hours and tried one more time to start the engine inverted before attempting the bench run. I also made sure that I had plenty of glow charge. I didn't even prime it and it started the first flip. Was able to keep it running until I tried to adjust the mixture control the wrong way. I did start it again and it ran really smooth. The most I could get out of it was 6200 rpm. Brought it back to mid range 3500 and let it run for a few minutes, I did adjust the low end as you suggested and that seemed to do the trick. Not long after that it quit.. Opened the mixture control alittle more however it would not start after that. I even connected the adjusable glow starter to it and opened the current as much as I could. It did not blow the plug however it still would not even fire. Checked the plug several times and some times it would be flooded with fuel and other times it wasn't. I have ordered the cline reg and the iron bay reg. I believe my problem is not enough glow and not a steady stream of fuel. I noticed quite a lot of bubbles in my fuel line. I am now going to btry to bench run it. What I don't understand, why does this engine run one time and not the next time in the same time frame. Very puzzling. Oh well, I will resolve this issue. I am not going to give up. The bench test shopuld tell me if I have a bad engine.
Ron.