Forgive me..but I need to confirm something.

With a 2stroke, I have no problem setting the high speed needle.

But this same procedure could cause problems on a 4-stroke.

If I lean to max RPM then back off to slightly rich, I stand the risk of detonation BIG TIME.

And if I use RPM, I can richen it up to whatever I want (if the prop isn't loading the engine enough).

Right now, I'm not sure if my YS 110 is going to be happy with a Master Airscrew 3-blade 14x7 prop.

I can richen it to @9300-9500...but she is really rich.(Tons of smoke and a gurggle break at high rpm)
good for break in...but I don't think she is going to be very happy.

otherwise It seems to overspin that prop to 10,500.
I risk floating a valve at that RPM.

Is it too lean?...well that's my problem..I just can't tell straight away.

What should I look for to make sure she is happy, and not leaned too far?

This is my first 4-stroke..but I'm a fast learner.

What I've read says to richen it to @ 500 rpm off peak RPM.