https://youtu.be/w-kJES0FCIE?si=EaAnNMI-8UeISJwf
This video is the most useful and informative lesson in cleaning small outboard engine carburettors. You might find it helpful, I did.
My Yamaha 4 was stored for two years in very good condition. But not surprisingly failed to start. It's nearly always a dirty clogged carburettor. Of course they should be stored dry but do you remember to drain the float bowl before storage.
Cheers
Chris
Best wishes