[johnnyrod]

When you say the carbs were balanced, you mean after they went back on the bike? Because there's no other way to do it. Regarding jetting, it could probably do with some rejetting to match the can but stock will work just fine if a little lean, so if in doubt use that. Check EVERYTHING such as idle screw settings, needle clip settings. The downside of buying an old bike is people have had a lot of time to "improve" it. Also check for a stuck choke plunger as my front one is way worse than the back, though all this really does it richen it up a bit, it doesn't cause real running problems.