Originally Posted by speedracerntrixie

The best thing you can do is mount it on the airplane ( with the wings mounted ) and fire it up. Get the needles adjusted to the point where you have a reliable idle, good transition to full power and slightly rich on the top end. Then go fly the engine and make small adjustments based on what was observed while in flight. What they are warning you about is mounting the engine too rigidly and setting up a destructive resonance. Personally I have flown every single gasoline engine I have ever owned on its first tank of gas.