You may very well be lean....turn your high speed needle all the way closed...then back out 3 turns and see what happens...then tune from there

The high speed needle at this point have little or no effect on the engine at this point.

I will try swapping the carberator and exaust line. I think I will have to dump the fuel somehow to make surethat I can hear the clunk. I tried shaking the plane. I am not sure if that helped or not. It sounds like the engine has good compression.