the big screw that sticks out of the carb is the idle adjustment
the mix screw is the tiny one that is recessed .
i do not know of any carb restriction except that the main jet is smaller than it should be..
there is also a "wedding ring" restrictor in the variator
oilyhans
i own a scooter shop with rentals ,sales& racing parts.
i also appraise scooters for KBB.
2003 Vino classic stage 0.75
de-reged stock variator w/8g sliding weights.
1.5k rpm springs
42mph
2005 veniceLX ~70cc~upjet~1.5k rpm springs & 7gr sliders
46mph
KeyWest de restricted~8gr slide