Next step:
-fan cover off
-CVT (front part) completely off
-sparkplug out
-valve cover off
Now I would remove the scooters middle plastic parts.
-check whether something is blocked either on fan side or at cams
-turn loose both valve adjustment studs
-spray some thin oil into cylinder
-put CVT nut on and try fore and back
Has there been enough motoroil in it when it stalled?
If not, your main bearings are most probably finished.
If there was enough oil, your piston/pistonrings could cause this blockage.
Not a big deal, just a new piston, rings and gaskets.
This cylinder is very durable, because of its coating, and mostly not demaged