Revivng slumbering motorcycle

no fuel stabilizer, been empty for...15+ years.I think it ran before it was put in the basement.At least once since I've lived here which is 20+ years.
no pictures yet because it's not in my garage. Will post when it arrives. and for same reason not saying,don't want to jinx the deal.
yes,I'd be interested in learning more about the sealer. it's either that or a $400 look a like metal tank that they say "should" be pressure tested before installing.
fortunately,from what I remember,single carb feeding two cylinders.
didn't they have something that fit over the top of the carb and that was part of the synchronizing?
tjpatte,sounds like the problems with some mowers I pick up from the curb. what was a duck?