Break in your engine using the prop and fuel you'll be flying with. ABC/N engines like a little castor in the fuel, like Morgans Omega. Run it at a only SLIGHTLY rich two cycle setting. ABC/N engines need to get up to operating temperature to properly break in. When it will hold a constant idle for about 30 seconds, accelerate cleanly, and not sag when the nose is raised, it's ready to fly.

Dr.1