Thanks for your responses. I will inquire about the compression test.
When people say "replace the piston rings," does that always entail a piston replacement too, as well as reboring the cylinder? Was hoping the rings could simply be replaced (but I understand those rings require quite a bit of work to get to).
Also- just how bad is losing 1 pint of oil per 400 miles at highway speeds? Is this in the normal spectrum? It seems to be on some bikes, but seems high from what I've read about the TT6000 / XT600. My impression was that once you start burning a fair amount of oil it progresses quickly, which is why I'm looking into this- is that accurate?
Thanks again for your insights.
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