Why does my Kawasaki ZX6R not want to go faster than 30mph?

[Hecker148]

Whenever I go over 30 mph my bike seems to seize up, its very embarrassing as it means I can't speed up and it feels downright dangerous when it happens.I can't seem to explain it. I took my bike to the garage and they road tested it saying it was fine, and the problem was due to my riding style. I have made sure that I have no contact with any gears/brakes when the problem occurs to ensure I am not making the bike seize unwittingly. I am riding in a straight line and it still seems wrong. Anyone any insight?

[rugeleyboy]

what do they mean by riding style?

are you on and off the throttle, a bit nervous of giving it some??

what speed does it go to?

[Hecker148]

I came off the bike a couple of months ago for the first time, at first I thought I was being nervy and accepted the 'it could be your riding style explanation' however got on the motorway this afternoon to get her out, put the throttle on and it just wouldn't go faster than 50mph without feeling unsafe. Now I've been quite happy exceeding my personal speed threshold before but now its like the rear end is seizing up. Can't think of a better way to explain it. My instinct tells me that its nothing to do with my riding style. Maybe oil change or chain issue, but surely the garage would have picked up on that!

[markja]

get someone who has been riding bikes for a while to give it a carefull roadtest.also check the discs as soon as you get off the bike see if they are hot. caution though if the braskes are binding the discs will be very hot.

what area do you live in? near watford? i'd have a look if you are.no cost!

fazer 600 in case you're wondering.

[Hecker148]

thank you ^^ for your generous offer, although I'm way up north in Newcastle. Friends been on the bike and it seems its not just me. He thinks it might be the brakes, although i'll wait and see from the garage.