With any bike over 15000km you should be looking for the general stuff brakes, steering bearings, chain, sprockets, tires, etc. Obviously the higher the mileage the more often this stuff would be replaced. Service records are always a plus Personally the wife rides a CB600F4 with 83,000km and it runs like a top.
CCT's (Cam Chain Tensioner) are common on the CBR's you can purchase an APE manual one for around $60.00. This will be determined by a rattle when the bike is warmed up on the right side of the bike and the sound of marbles when letting off the gas around 5-7k in the rpm range. The stock ones fail all the time every 5000-15000km.
However all this being said nothing beats taking it to a mechanic before purchasing. I normally have the person meet me at a local shop to look at the bike then pay to have the mechanic do the safety on it and ask for any recommendations. In my opinion it's cheap insurance if you are purchasing the bike.
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