I have done the cleaning portion, several times. My older bike sat for many years before i bought it and it was super crusty. The problem is that it has 4 carbs and they really need synched and have the mixtures set. The guy i bought it from screwed with them and they are pretty bad. Decent enough to put put around town but now that i live out of town i hardly ride it because is will hardly touch 50 when its pegged. plus when you do peg it, it really only runs on one cylinder.
i bought the shop manual for it and this spring i will tear them down and re-clean since it sat a bunch last year, then at least attempt to set them back to factory presets.
I called the local shop and they told me it could be up to $80 or more PER CARB depending how much time it takes. That is insane to me. I need to look for other options. some savvy garage tuner who i could slip a hundred to or a couple dozen fresh eggs ;)