Your first tank of fuel will probably run rough and drink the fuel big time. You may notice some smoothing out after that first run. Also, you should see fuel consumption drop quite a bit at some point. I ran my Saitos about an hour before putting them on planes. I have a .82 that needs breaking in soon. I'll put an hour on it and set the HS needle valve then. I may lean out the LS needle valve some but not completely set until I have another couple of hours on the engine. Saitos take a while to break in, but they are smooth engines once there.