On a 95 Xr600 top end rebuild, how do you tell if the chain guide, chain tensioner or chain damper need to be replaced? My chain jumped time which was really streched. I want to make sure when replacing the chain that I replace the other items if needed. They look good, but are there any thickness measurments you can take to see if the guide or tensioner are worn. The damper only moves in one direction and I know that is the way it works, but are there any other things to look for in the damper? Also where is the best place to buy a stage 1 cam? Thanks for your help.