The engine is running beautifullly. 18.5 lbs static thrust. 520 degrees C. But on switchover, there is still that long yellow plume of flame. Would like to reduce or eliminate it. I'm assuming it's from the burner (not the injector), but I'm not sure of that. It disappears in a few seconds, but in the meantime someone could turn their slacks into shorts if they're walking by there.