Planned acquisition of CBF600SA

Hello. I’ve been looking around the bicycle market for a long time and looking for a lot and comparing I came to the CBF600. Is basically exactly what I imagined: tours suitable, more than 50ps, half-covering, ABS and what is most important: it seems to be affordable. I thought of a used from 2004-2006 with up to 20,000 km on the clock. Should be to get for 3k€. How about tachomanipulation on the device? Is there any possibility of a manipulation What do I have to pay attention to when buying? Would be quite grateful for a few tips on the subject. Will my first own mopped and I am rather inexperienced. Further the time of buying, the season for this year is over anyway. But in winter the prices of the needed should be the most bearable. Does anyone have any experience about this? Thx Vorab.