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You can follow this guide.

Used Motorcycle Evaluation Guide

The guide suggested by cbr600 is pretty comprehensive

A few tips from my personal experience
1. Always take a friend along who has SBK experience, even better is someone who has owned a similar vehicle before. Each SBK brand and year has its own little niggles and foibles so it helps to have someone who has driven the same kind of bike before
2. Better yet, ask the owner to take it for a service, if needed agree to pay for the service. The addition 4-5k you may spend on the service out of pocket will save you tons later (Again from personal experience). Also check with guys like KRP, they maintain an extensive service record of vehicles they have worked on and if you are lucky may have even worked on the bike you are trying to buy. (For eg. in my case they were able to tell me that my bike had been in for service before and had minor work done, but that the odometer reading had been turned since they had done the service a couple of years back at a much higher reading)
3. Lastly talk to the SBK groups, most riders are part of some group, if you are lucky you will learn more about the bike and the owner driving style (This would help you understand the extent of potential wear or tear on clutch plate, brakes and tyres)

Hope this helps and best of luck in your hunt

Do we have good SBK mechanics in your region. If you could catch hold of one, he could accompany you to inspect the vehicle. This is one thing we do for normal bikes and i guess would be fine for SBKs too, considering that the mechanic is trustworthy and skillful.