[quote=]OK, so if ligher weight oil then 20/50, which one? 10/30?

On turning it back the reverse direction, the cap did not move initially. I didn't mark it but I can turn the crank a bit before the rotor moves at all. So I guessing it looks like the chain is loose. [/quote] I ain't an oil guy so I have no valid input but first I'd research & see if a straight wt or a multi is the best way to go. On the slop see how many degrees of play you get on the dampener AND there is/can be slop in the chain/gears and in the dist lower tang/intergear slot that it fits into & both need to be checked/dealt with as needed and they both add up in what you see at the rotor for movement with the crank being turned