The carbs were actually never gone into, in 20 years of the bike. The guy who sold it to me, it would seem, basically cleaned them enough to get it started. (spray can). and then lied all the way to the bank.
I'm ordering a fresh set from The Diamondcut guy and going to put those on.
Correct. the rear cylinders had a lot of carbon buildup. Specifically the left rear. Changing plugs and carbs and going to see how it performs from there. Riding like a scalded dog to see if I can clean them out some, then another compression test.