I have 4 DA50's and they all came from the factory set as follows: low end 1.25 turns out, high end 1.75 turns out. Those settings worked just fine but I did richen the high end by 1/8 turn on our first hot day because it was leaning out some on vertical climbs. The manual states you can start the low end at 1.5 turns out but I found that too rich for reliable starting and idle. With the high end set to 1.875 turns out I get some very minor hessitation during pre-flight throttle up but goes away during flight. After breakin I will lean the high end some. The plug after 20 flights was dark tan. The low end at 1.25 turns gives excellent transition.

On the first engne I had the low end needle back out after about 15 flights, don't know how and it has not happened since. Anyway with the low end backed out to about 1.75 turns, the engine would not start. After I set it back to 1.25 turns it started right away.