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Message: [QUOTE="Dirt_Boy77, post: 635456, member: 43893"] I think I may have found the reason for the scoring on my cam lobes. I remember one of last years dirt rider magazines where they did a run down on a bunch of bikes and told you the known problems,what they were good for,etc. In the colum they wrote up on the 86-95 XR250Rs they listed under KNOWN PROBLEMS that if you rode alot of trails like up in the Rocky Mountains it was hard on cams and rocker arms. I would think alot of the rocky mountain trails would be alot of low RPM putting,etc because of the long and steep hills. My singletrack is really tight and I can't ride it to fast because its so tight and I have to be careful that I don't rut it up bad either because my brother,dad ride mountain bikes on it. I have the bike putting at low rpms most of the time on the singletrack trail. What I am thinking is since I am riding at really low rpms alot the oil pump is not pumping near as much oil as it is at say full throttle. Could this be causing the scoring? I took one of the valve adjustment covers off yesterday and started the bike and turned the throttle to where the engine speed was just a little faster than idle,in about 5 seconds or a little more it had the bottom of my gas tank,backside of my front fender,head pipes covered in oil so it is getting enough oil I would think. So the big question is could riding at low RPMS alot like I do be causing the scoring? Thanks guys,Matt [/QUOTE]