My 2000 XR650R died on the freeway Monday. I walked it home (7 miles) since my truck was in the driveway and none of my buddies would answer their cell phones! Anyways, I pulled the engine out, and tore the top end down, and found a broken timing chain. The rings have an end gap of .052 thousands of an inch. Hmmm... might be the reason the engine's been burning a quart of oil every 700 miles or so! The piston looks perfect, no marks or carbon buildup. It does show some wear on the skirts though. The exhaust valve stems have a fair amount of carbon buildup in the exhaust ports. All bearings, camshaft, and rockers look fine. The bore is perfect, no scratches, nothing. The original crosshatch honing pattern is visible. Have I missed anything? Based on previous posts, the HRC timing chain setup costs over $500! Is it worth it? What about the Kibblewhite valve set, how expensive are they? Or are the stock replacement parts good enough? I ride the bike to work every day (40 miles round trip) and putt around Prairie City once a month with the kids. Ted K.