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So it turned out that big, thin nut that holds the clutch assembly together came loose? If so, you found out what was going on. There is a special tool that locks that whole assembly together. The clutch springs and/or the torque (contra) spring can be changed without the tool, but the tool makes it a easy!
You can get the socket for that nut from buggypartsnw.com. They sell a dual sided socket that has both 39 and 41mm. We get individual sockets from Northern and have the inner bevel planed off for a better fit, but the buggyparts one works very well. Forgot the torque on that nut though.
Side note: I never would have removed the cylinder if there were no scratches on the exhaust side of the piston or if there was not a hole in the top of the piston. That was just extra, unnecessary work. At least you now know the top end is all good.
Get it back together correctly and let us know if all is well. Zumas are quality, tank like little scooters. I've owned at least 6 in the past, 2 of those pre-bugs. You have a bug-eye. Good luck getting her purring again!
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