Looking to buy a ZX-6r (Pre 2003)

I am in the process of getting a '02 ZX-636, is there anything that I need to look out for?
When does it usually due for major service? Most of them have done on average around 20,000km mark.
Any help is appreciated.
Cheers
Leon
When does it usually due for major service? Most of them have done on average around 20,000km mark.
Any help is appreciated.

Cheers
Leon