I have one of the two on-hand carburetors completely stripped down. The gasoline that sat in it for so long had turned to thick varnish, clogging nearly every part. I have cleaned as much of that out as is possible by hand, and to attack the rest of it I'm soaking the internal pieces in a nasty solvent called Clean-R-Carb. We'll see what a good overnight bath in this stuff will do. Tomorrow I'll scrub them down with a wire brush and reassemble it.

I'm also using great website from a company called "Consolidated Motor Spares" over in the Netherlands. They help people find parts for old or obscure bikes. They have original microfiches for component systems on old bikes, like the '65 Honda 90's carburetor. These are really helpful in the re-assembly process and of course for ordering replacement parts.