I first noticed that my master link on my plated '93 XR had a shine in the edge of the clip, a few miles later...most of the links have a worn groove to the outer radius side of the link. Has anyone else had to replace the lower chain guide near the foot peg? And what was the cost the guide? I have a Gazillion offroad miles on this thing and the stock sprocks ur shot too, so this is the time to regear it for better freeway speeds. Which is the best combo of gearing for less RPM at 65 MPH for a '93 600?