Rough Running 912ULS at idle
2016 Evektor SportStar MAX/912ULS with 500 hours started beautifully and ran fine for several hours after annual condition inspection. (balanced carbs with vac gauges during inspection). Then difficult to start (cold and hot) but runs fine for almost exactly 11 minutes before stumbling at idle - idle gets rougher and eventually quits within 1 minute. Restart requires throttle opened 1 to 1-1/2 turns and continuous cranking through intermittent firing until engine catches. Runs normally for almost exactly 11 minutes when rough idle begins again until additional throttle is applied. Switching mags L/R has no apparent effect on running. Applying choke worsens roughness. Aux fuel pump off - running only mechanical pump. At 2500 rpm / 16.6" MP, fuel pressure is 4.9 psi, fuel flow is1.8 gph. At 1700 rpm / 12.8" MP, fuel pressure is 5.0 psi, fuel flow drops from 1.8 to 0.4 gph before quitting.
