My XR developed a deep knock at under a light load. Seemed more pronounced warm. It was not getting worse but I could not stand the noise so I have pulled the motor down and found that the small end off the rod has .003'' clearance between it and the piston pin. There is obvious wear and the ends look tapered. I purchased this bike new and have a second bike so it's like new other than the rod. I even have the oem chain which I'm sure could have been replaced. Oil changed everyride. Not a notch or grove in the clutch basket.I'm puzzled that the rod does not have a bearing or bushing in the small end? Looks like I will be installing a new crank. Has anyone attempted to replace the rod with an aftermarket one with an insert? Looks like all modern four strokes are like this. Maybe I should purchase a RCE jig and see if I can replace this rod as a $500 oem crank is the only one I can find. My concern is that this condition will occur again.Wonder why they dont press the pin into the rod? Any advise or wisdom would be appreciated. Thank You!!