Well, our last XR finally bit the dust. began to consume oil quite rapidly, and finally gave up the fight a few weeks ago. Been using this bike as a teaching bike, daughter's boyfriend is learning to ride, and this XR has seen its fair share of abuse. It's been through 3 other riders, thrown off a cliff in Baja, submerged in a small pond, and generally had the snot beat out of it. I had done a 270 kit in it about 4 years ago, stage 1 cam, and not much else. Kid was riding it basically DRY, very little oil actually came out of the case. Oil starvation from the top down consumed the cam, all 4 rocker assemblies, but only ONE cam bearing- sprocket side bearing is ok (Still needs replacing but at least it turns with little effort). Surprisingly, the piston did not seize in the bore, and has little to no galling- sleeve looks ok, but we are still replacing that as well. Yes, there's the opportunity to just go to 77mm with the stock sleeve, I already ordered the 78mm sleeve and piston kit so we are going 284cc. Connecting rod small end was at the wear limit, as was the play on the bottom end so a new connecting rod and bearing are on the way. New hotcams stage I cam is ordered, new timing chain, and a handful of new bearings in the case including crank bearings, counter balance bearings, etc. I helped another member out here a few years back with his XR400, figured I might as well document my own crap being rebuilt. I'll get some pictures up here soon, to show progress and improvements.