I have had fuel go bad in three years. The LA .25 would not even start. Other motors did. It may pick up after a while. I would only run it at full throttle with new fuel for a while till it is broken in, OS stuff is not usually really tight. Maybe get some new fuel and use that for the McCoy. A 10-6 is about right, maybe a little smaller for break in. Mine is set at 2 1/2 turns, I did not seem to have written any notes on it, but assume I have ran it.