I fired up my OS MAX 120AX this morning and it's nice to get a big grin on your face early in the morning while your still having coffee. I slapped the APC 17X6 on, fueled it up, put heat to the plug, primed it and on the thired flip it fired up. I was using Byrons 10% fuel and ran a half gallon through it. I don't have a tach so I don't know what rpm's it was running at but boy did it sound good and what power. I bolted it down to a steel stool I use at my work bench and the engine wanted to drag it away. This was to cool. Can't wait to get it on the plane and in the air.