OOOOKKKKKKK, Ive come to the conclusion that there is something besides the HSN causing this lean out...
Why?

I spent 2 hours adjusting the HSN in small increments with zero change in the conditions of the lean out. I richened it to the point of spattering and bad performance but everytime it cleaned out and the rpms got pretty high, it died.

I began to think there was a hole in the fuel line or air getting into the tank somehow so I held it and slowly advanced the throttle to wide open. All the while watching the fuel line....not one air bubble!

I then thought it was the fuel filter that I installed when I purchased it that was causing the fuel flow to be restricted and starvation at high load.......so I took the filter element out of the annodized filter case. No change at all.

I do know that its leaning out because when the engine dies, about an "inch" worth of air back siphons from the carb into the fuel line and sits there.

Is my fuel system not pushing enough fuel to supply the engine at high rpms? thats what it seems like to me.
I took the pressure end off and blew through the system as hard as I could. The fuel only inched out of the carb end....should it be really flowing??
Dale, give me some feedback bro!