WHOOOOOPIE! WE FIGURED IT OUT! I tried the Uniflow setup and it seemed to sorta work, but the problem is, airplanes throttle back. As soon as I throttled back the fuel pressure dumped into the muffler. Sloppy mess and a way rich motor.

A buddy at the field had a similar problem with his Evolution engines and said his fix was an Evolution glow plug (I was using an OS #8). Luckily he had an extra! I also reverted back to a normal vent-line setup. The Evolution plug changed everything. The engine was running way rich as well. Did a few takeoff-land-adjust cycles on the engine and I finally flew a sucessful outside loop (running 8).

The next couple flights I practiced the Sportsman SPA manuevers. She's tracking great! A few more practice days and we'll give SPA a shot in September (Ft. Worth).

Thanks for all the great advice fellas. Dave