Follow the manual. Use Lawnboy Ashless if you can find it (I get mine at Albertsons), mix 33:1, set needles so engine runs decent (don't peak it out and don't set blubbering rich) and fly it. Burn 6-10 gallons of break in gas/oil and switch to synthetic (I use Amsoil Saber mixed at 80:1, or 1.5oz per gallon). A gasoline engine is much more reliable during the run in process than a glow engine, so it's safe to fly it during that period. It is adviseable to adjust the idle a little higher while in the air though for extra measures. It is adviseable to fly it because that provides better cooling for the engine and it takes some time to get that fuel through it, so why not have fun doing it. As you run fuel through the engine, you can adjust the needles as necessary. Running a gasoline engine blubbering rich has an adverse effect on the engine, it should always be run reasonably close to optimum needle settings.
DKjens