Welcome Art!!
In various other posts in the Forum, there are online parts suppliers listed.
I'm unsure if there is a rebuild kit available.
Since yours had been sitting for that long, I would think that the carb/float just needs a good cleaning. Also, check your gas lines, as they may have become fragile/corroded over the last 20 years.
Finally, replace the fuel filter. I would do all of this first, before rebuilding.
Rattosh51
YT6800