I've ran into an issue recently. I needed to replace the clutch cable's inner and was pretty confident I got it right. When I held the clutch in and pushed the kickstarter, it just dropped with no friction; when starting normally, it didn't seem to have any issues. Idled just fine from cold start and when warming up. But when I got into 3rd and 4th gear, after pulling in the clutch, the engine would slow to crawl and die. Pretty sure it was stalling. I immediately thought the clutch cable was too loose, but after tightening it up only a little, it's now obviously too tight. I can't even start it because the kickstart lever just drops with only a little friction. So now I'm not so sure.
Is there a very small margin when adjusting the clutch cable? Or could the issue be elsewhere? I'm starting to suspect the carb with the season change, but it ran great thus far for a good 500 miles (during the winter, it was a little more difficult to start but ran great warm).