Please, no posting i the wrong forum. This should go in the "general" forum since it states there that if it don't fit anywhere else to put it there. Anyways, to answer your question...The xcr ( I always have thought) has been a pretty good engine. Lots of power. I wouldn't really worry about it having pipes and all. If the guy didn't ride it hard before you, it should be fine. You can barely ever estimate how many miles you can get on an engine before a rebuild. It depends on too many factors. Mabye Polaris-Man knows more on this stuff, he is an xcr man. I am not...he he.