Your mention of the power jet earlier opened up a window for me. I didn't realize this little carb had such a thing. My hypothesis is that the main jet is either still dirty or needs to be slightly adjusted to provide more fuel.
I was really confused because the bike would idle fine, so the slow jet seemed fine. It would also rev like a crazed banshee. It just wouldn't run smoothly under load at middle rpm.
I understand now that the power jet is probably clean (I did dip and scrub it) which is where the beautiful high RPM is coming form. But the main is the problem. Without the power jet I couldn't understand how it would run well at high and low rpm but not well in the middle. Now it makes sense.
I will test this theory tonight and report. So close!
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