I bought a Royal 40 about 15 years ago and up until last year it had never even been run. The engine looks to be in great shape but I just dont know how to set the needle valves. I started at about 2 turns out, but that seemed really rich. I leaned it slowly out and it ran better. It seemed to idle and have the best midrange around 1 1/4 turns out. However, when I accelerate to full throttle it would slowly accelerate, rev up, then die. This happens if the needle valve is set at just one or so turns out or a 2 turns out. The needle valve setting doesnt really seem to matter.