cam chain

I split the cases on a K2 motor and the main bearings were easy to get out of the cases. It looks like they may have been turning in the races. I removed the crank with the bearings on it as well as the cam sprocket. Is this motor toast? How do you get the cam sprocket and main bearings off...

I just purchased a ST90 with 6400 miles on the clock. The bike appears to have been well-taken care of over its life. I got it running again, but it has quite a clackety noise coming from what I believe is the cam chain. I attempted to tension the chain via the bottom bolt cover/threaded rod...

I have a bit of clacking at low RPM on my CT70 (K0). I went to adjust the cam chain tensioner by removing the sealing bolt so I could get at the tensioner adjusting bolt. Removing the bolt, the spring fell out. I assume that the tensioner adjusting bolt is missing. I couldn't get to a good...