I just got my first gas engine, a DA-50 with a Pitts muffler. Put it in a Wild Hare Extra 300. It started right out of the box. I now have 50 flights on it and just completed using the fuel with break-in oil. It started up easily on all 50 flights and has run very well. After about 20 flights I had to lean the carb but that is all I have done. I power the ignition with a 2300 mah A123 battery pack and have had no problems. I highly recommend the DA.