I wonder if it was on 04/05 or 06/07 or new 08 one. I manager 189mph on the clock at the Nurburgring on my 04. 170 is a bit excessive but as with all things I think the other offences play a significant part. Perhaps 1 year on an SR50?. The annoying part of any license losing is that you lose both the CAR and the Bike if you get busted on either! Pay two lots of increased Insurance! I think jail is ridiculous. Nowhere near the same league as rapists etc...
Which is why he probably won't get life, put in soiltary and be in a maximum security prison.