I like what Gyro said.
In addition:
Back in 2001, when I bought mine (see signature block) used (with only 50 miles on it), it had been sitting in a storage shed in Houston, TX, for about a year. It had been put away with no prep. As a result, when I bought it, it was running really lean, with excessive (even by our standards) backfiring.
When I tore the carb apart, it stunk like varnish. I'd been down that road before.....
Anyway, after stripping everything (and, I mean EVERYTHING) off of the carb body, I soaked said carb body in
Berryman's Chem-Dip. It cleaned up all of the myriad small passages that are in said carb body. The bike's been running great ever since!
BTW, I don't know if today's version of the Chem-Dip is as powerful as the stuff I used over 11 years ago. It was nasty shizz, that' for sure!
Good luck!