[padly1995]

Hello,
You might remember from few years ago I couldn't figure out why my 1992 Piaggio sfera 50s (same engine as on 1gen zip, air cooled with short case and 10" wheel) has no power.
Scooter was waiting in the garage, but now I pulled it out and decided to try to sort things out...
Problem is that it lacks a bit of power on acceleration and top speed is around 50kph, it should be a bit more than 60kph.

Quick list of things what I did in the past:
Tuned carburator (phbg 17.5mm), spark plug is brown, there is no bogging, it fires right up when cold or hot.
Tryed different roller weights. Stock is 5.2g, I tryed from 3g to 8g and got best resoult with 4g.
Changed exhaust from stock (with alot of holes drilled in it) to stock minarelli exhaust. This also resoulted in a bit of improvement.
Added 5mm bushing to stiff up the clutch counter spring and it improved power a bit, tried to add another bushing and it made power loss.
Installed new belt...
Inspected reed valve and it's reeds, everything else for leaks, changed sprak plug...

So current setup is:
Dellorto PHBG 17.5mm with lawn mower air filter (mallosi mhr filter that it camed with had too much airflow)
New belt 734mm x 17mm -Do any of you know if this is correct size?
New spark plug
Bushing under clutch counter spring
4g roller weight

I attached photo of it's CVT.

Do you know what compression should motor like this have?
Thank you for help