Originally posted by Flyfalcons
Don't know about thrust, but if you're five turns out and have to adjust the throttle to go lower than 7000 then you aren't getting it rich enough. With a Perry pump mine is 1-1/2 turns out for flight, and turned a Top Flite 18x8 at 8800 RPM. Since then I installed a Zinger 18x6-10 which performs better. You should be able to get the thing to die by turning it out 5 turns. 9000 might be possible on certain props.
As I indicated above, I think the Cline Regulator keeps me from getting it rich enough to control rpm with the high-speed needle. I say 5 turns because that is what I started with -- was a Moki recomendation. I actually tried to turn it out significantly more and it had virtually no effect. At one point that needle was almost all the way out and the engine was still running 7000+rpm.
I have been very dilligent in monitoring the engine temperature while it is breaking in. 235 degrees is the maximum I've seen at the exhaust header and much less than 200 degrees on the cylinder.