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It would'nt hurt changing the oil for a half descent 10-40w semi synthetic oil.
try chinesemotorcyclepartsonline.
Just don't thrash it.
I'd need to see/hear it in the flesh to sort out so I'm unable to help. sorry.
I would of thought you'd get the noise at any speed ? Is it "pinking" does it need a bigger main jet ?
What scooter is it ?
standard.
A std unrestricted zip will do 40 ish mph so so somethings wrong .
Fit all the original transmission and exhaust and try it, change one item at a time to find what piece is making a difference.
Oil needs to be checked weekly, it only holds a litre at most and engine will burn some away when running.
Try a new plug and cap. It must be a efi model ?
It probably is a gy6 engine, 170cc barrels available but to be honest don't waste your money !
Have you got the spacer between clutch bell and outer cover ?
I'd use a 90-92 main.
It must have a nut on outer cover for clutch?
What scooter ?
The old one will probably have the size stamped on it, different sizes are to compensate for machining tollerences and compression. If your unsure...
It could be just a bit of moisture from airbox as you say but whenever i drain my gear oil it's never clean,I never change gear oil anyway, I've...
It's normal to vibrate on it's stand, check carb mixture settings and check reed block to make sure reeds are ok.
What old vespa is it? what model ?