Did a lot of research on this and tried some things out but I'm still having an issue.
Here is my current setup:
78 Magnum XK
15mm Bing (needle on lowest (richest) clip with a 2.17 atomizer and 78 jet)
Metal mesh "Ken Roff" Filter
MLM People's Pipe (larger header)
E50 Jammer v6.4 with weakest springs (soaked in Royal Purple Max ATF)
Royal Purple Max ATF (stock fill level)
No air leaks or related issues.
My problem is that - from a stop - when I twist the throttle the RPMs rise quickly but the ped doesn't accelerate at a comparable speed. I think the clutch is slipping too much. If I pedal as I roll on the throttle it "catches" and accelerates better. Without peddling the moped struggles / slowly gets to 10mph or so, RPMs then drop and I'm assuming the clutch engages and accelerates as anticipated all the way through the rest of the range up to about 40mph.
Anyone have any ideas? I'm thinking its ATF related but haven't tried any other fluids yet.