Before working with anything on the throttle body, which if it gets disturbed may never get right again~! - - your issue could be any number of things.
The whole EFI system on this scooter has been pretty much bullet proof.....
Throttle body and/or the ECU have rarely proven to be the issue....no matter how it has been used, or not used.
Never had an issue with the mass airflow sensor on a LIKE200i reported here.
Things can corrode, (starter switch, frame ground, battery terminal, etc.) or rot over time. Especially if not ridden regularly.
A start then stall ...may be a torn/rotted fuel line on the fuel pump in the fuel tank. "Getting some - but not full fuel pressure to the injector" There have been several instances of this happening with these older, "parked", LIKE200i's. A rotted line in the tank can carry junk to clog the injector --- but the injector itself rarely fails if unmolested!
More info on your scooter will be a big help.
When was the last time it ran for any length of time.....like being ridden on the road?
Last time the valves were adjusted?
Any modifications, crashes, floods, fires, tip-overs? Was it stollen recently?
Yours may be one of the earliest LIKE200i's we've worked with here. I think they arrived in Noth America @ 2010.
Photos are always appreciated ~!
Stig