More follow up.... Today I had ridden the QT for about 5-10 minutes. The "dying" issue has been resolved. Victory!
It was still bogging WOT so for giggles I took it for another very short test ride with the air filter off, no change. I dropped the jetting from whatever is stock in this Miniky clone carb (probably 70+) down to 68. It seems to have cleared up the bog WOT except for at the top of the RPMs (30 mph). When I say bog, I believe it is four stroking as if I were coming down a hill.
Is four stroking normal at WOT, top of the RPMs and top speed? It's a Niche 60cc kit and the top speed is about 30mph-32mph on the speedo. When it gets there, it kind of bogs, then catches, then bogs....and I can somewhat control it with the throttle.
If this is normal, then I guess I'm done unless I want to get into new pipe and and filter. My goal is to keep it a strong runner that appears stock for that nostalgic buyer. ;)