Bike Bogging Problems

Hi there, recently bought a 97 600 SRAD. The bikes very clean and doesnt really have any issues except one niggly thing. The guy I got it from says he kept it at 6000 revs as if it was below that it would bog down if trying to give it a good bit of throttle.

I tried to find other similar posts but couldn't see any the same.

It isn't really a massive issue but would prefer to resolve it if I could. Does anyone have any ideas or even a link to another post? Thanks for any help.