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Message: [QUOTE="DualSportr, post: 301316, member: 19592"] <<The previous owner flushed the system by changing the oil 4 times and running the bike between changes.>> Hate to say it, but I'm with Bill's #2 choice on this one. We had a YZF426 race bike that suffered the same fate. Engine only ran for about 20 minutes before it started smoking badly and was removed and shipped back to us. Every part inside had at least .020" to .050" of material removed from it. Not a single piece was salvageable. Keep in mind this was a Four Stroke National engine which had just been blueprinted by our shop. If nothing was worth saving in that $20,000 machine, I don't know how many bits inside the XR250 will be worth more than a paperweight. BTW, if you do tear into the engine, make sure you have a good idea of correct clearance specifications - since everything will look beautifully machined with perfectly beveled edges - it'll all just be waaaaaaaay out of tolerance. [/QUOTE]