My 87 turned 70,000 yesterday. Had it since new. I've replaced the fan switch 3 times, coils last year with stic caps/coils, cam chain adjuster with the APE unit. Routine/preventative maintenance items like wheel bearing changes, oil/filter changes, valve adjusts, etc. Has been a very good machine thus far.
Look at the sellers other older items sitting around for an indicator of whether maintenance was done.
If it looks good, starts good and runs good, I'm sure it is ok.