[Mark R 1200 S]

To attain that mileage, very likely items such as coils and 02 sensors have been replaced already, but any documentation supporting such would be bonus.

Suspension and ABS brake components require checking. (Suspension should have been replaced, and likely needs replacing again a second time).

Clutch would have required replacement to reach mileage and likely needs replacing a second time.)

Final drive likely needs replacing if not already performed.

How noisy are the cam chains? An engine teardown can be warranted to fix rattling, sloppy chains/rails at around the 140K and over mark. (Big job.)

How out-of-spec are the throttle bodies?

Decent RT motors are available on EBay.

Really, if you plan on riding such a bike, you're in for quite a bit of wrenching and parts replacements. As a parts bike, most of the mechanical parts on it are likely unsuitable as replacements.

There really comes a time when bikes belong in the boneyard. I've seen my share of others' high-mileage, multiple-issue limpers and always ask the question: why settle for so much less of a motorcycling experience?