Thanks for your input.
I today saw the bike and did some basic test riding. Its engine felt strong and sounded ok.
There was marks that the rear tire does touch the muffler. So, some alignment problem is there, might be easily fixed though.
The only obvious problems I found was one leaking front shock and total lack of service history. The present owner has done nothing to it and knows nothing of its history.
I will see another '01 315r later this week. It has seen lots of competition but it has a solid service history and lots of things done lately.