Clutch won't disengage after removing sprocket cover

[His Dudeness]

Double check that the clutch cable is routed down the frame properly and more importantly, seated properly in it's holder down on the sprocket cover... If it isn't seated properly, it will be causing these symptoms!

good point. you'll probably have to take the cover off again to reposition it and adjust the cable back to where it was so you can check if the ball is there at the same time. sometimes it stays in the engine when you take the push rod out so just because you didn't see it the first time doesn't mean its not there