Yep. I always laugh at the magazine articles and thread posts that brag, "It ran perfectly right out of the box with the factory settings." There is no such thing as "factory settings". Only in so far as those settings will hopefully help you get it started. You have to tune it from there depending on your prop, fuel, elevation, oil, oil ratio, tune, airplane, atmospheric pressure, barometric pressure, humidity, and the phase of the moon. Well, maybe not the "phase of the moon" but I swear, everything you can imagine affects the exact needle settings to achieve a perfect run. The good new is, once you get there, it will rarely change much on a gas engine; much different from a glow engine that can change ideal settings from morning to afternoon.

AV8TOR