Another update:

Was flying few days ago, the motor running aceptably, just cruising around at abut 1/2 throttle when the motor suddenly died. I deadsticked it in safely and found that it would start easily, but die instantly the moment I got the ignitor off. This on an engine that always started and idle'd flawlessly.

I ran out of time there, but at home decided to swap over to the uniflow system, and also bored out the nipple on the muffler. There did'nt seem to be enough meat on the carb nipple to do the same, so I left that one alone.

Now the motor again starts and idles very nicely, and after fiddling with the main jet, got it doing 14,900 rpm with the apc 11x3.

The problem now is that no matter what I do with the main needle, the motor will bog and die as the nose comes up. Making it super rich gives a short time delay till it dies completely, but it will die.

I'm baffled. The motor runs better than ever as long as its level, but worse than ever when the nose comes up. I can't belive how much time I've spent on this problem already, and its still not solved.

Thoughts anyone?


Dean in Milwaukee