I came down with a bad case of Deezilitis today and cured it by unboxing my old SuperTigre .51. I did something a bit different, I mounted a Davis SoundMaster muffler in lieu of the ST Swing muffler. In the head on shot it is turning a Graupner 12x7 at 9,650, exactly the same as with the Swing muffler. It was 51 degrees and it fired right up flip starting. The fuel is Davis ABC mix.