Just remember, there is no such thing as a "factory needle setting". Those settings are only good to (hopefully) get the engine running. From there you have to tune it yourself for your engine condition, carb variables, air flow variables, fuel, oil, prop, airplane, temperature, altitude, barometric pressure, humidity, and month of the year. Well ok, not the month, but yes, all the other things are factors in arriving at a proper needle setting. That is why the factory cannot give you a setting that will be at all ideal for your particular engine.

AV8TOR