Steve
I tore all of my hair out trying to get the carbs sorted on my K2. Rust in the tank and some wrong parts in the carbs just drove me close to madness. I Just never felt satisfied with the way it ran and sold it in the end. Lovely bikes to look at but a complete PITA after they've been laid up.
I hope you have the patience to sort yours. My CJ250 used to go really well so I'm sure that they can be fixed if you have the time ..... :-)
G