Rear Wheel Lock Up On Acceleration - Suzuki Gsxr1000 K6

Discussion in 'Technical Help' started by Monners, Jul 24, 2017.

  1. No it's common on big bikes. Shutting gas isn't an option so just apply little rear doesn't slow too much
     
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  2. So we've just been taking a further look at this tonight. I think it's impossible for the wheel to go far enough out of line for the tyre to touch the swingarm but the rear brake disc has definitely hit the caliper holder which I reckon is a very likely culprit; (possibly locking itself against the brake pads or caliper as well??). You can see a distinct nick in the wheel spacer where it pushed up against something as well which all supports the theory. I'll stick a few pictures when I get them for you guys to see if you agree.
     
  3. Interesting side note is Vale was talking to one of the BSB race team managers who helps look after my R6 and he reckons it is definitely possible to lock the rear wheel with the brake which is something I didn't expect. He also suggested taking the sump off to look inside ( to check the gearbox? ). We already dropped the oil and it was completely clear.
     
  4. I have seen it Dave on Ducati bikes on the road. Only at lower speed but it's normally preceded by smoke and a small fire!

    Fwiw my K5 was always moving its rear wheel out of alignment no matter what I did. I used to over torque it because a couple of times it was so bad it made the bike handle oddly.
     
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  5. Can clearly see a chunk taken out of the spacer when it was slammed into presumably the swing arm. The rear disc is ground on the caliper holder. I'm feeling pretty confident the tight chain pulling the wheel out of alignement has caused this now. I'm still puzzled why the chain was so tight after the crash as I'd have thought we would have noticed it beforehand, but maybe it's a result of the wheel coming out of alignement?
     
  6. Pete was there when I put the rear in my gixer Thur am and couldn't believe how much tighter the chain was when nipped up. He could feel the immediate tension increase when I put that last 10nm or so on it, even tho the blocks were all tight and done.
     
  7. Thats interesting to hear and sounds like a likely possibility then.
     
  8. Thanks guys those look really worthwhile so I've ordered some.
     
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  9. They are on my list too.

    There must be a problem if someone has designed and selling a solution ;)
     
  10. Bradders - we have accidently ordered one too many. Worth pinging Vale on BookFace in case she has trouble cancelling one of the orders or is too late.
     
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  11. If you have and can't cancel I'll take it. Just let me know :)
     
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  12. GS700 on only dual carriage way in Iceland this May. Locked rear wheel in outside lane at 80 mph. Was interesting so feel your pain.

    IMG_9962.JPG
     
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  13. Wheel bearing had collapsed, do sprocket wobbled and three chain off teeth which then jammed in between swingarm and the like. Good job it was a hire bike!

    IMG_9958.JPG
     
  14. Oof bloody hell, you'd think of all things a hire bike would have that stuff checked?! Vale has bought new bearings just in case but they all looked ok to me.
     
  15. Hire place said ignore service light on dash. We serviced it but didn't get round to knocking off the service light. Read into that what you will. Iceland out of town areas is not a place you want a breakdown to occur.
     
  16. If the wheel has contacted the swing-arm, rubber witness on the inner surface of the swing arm will be obvious. If no marks, no mystery didnt happen?
    If the wheel moved forward on the sprocket off -side wouldbe symptom of the engine locking?
    IF the wheel moved back on the sprocket side? This would be consistent with wheel bearing fallure. Or something else impeding rear wheel rotation?
    think bearings and Brakes, Must have push rod clearance to stop the wheel cylinder pumping pressure and holding brakes on. Any brake lock on would have cause significant heat build which on the rear Discs would be obvious, (blue heat marking) Check the pedal high hieght is not set high enough for the rider rest his/her foot on it, as this would have the same outcome as Guy Martins
    Test the wheel bearings with the wheel out, by turning and feeling the inner races; if you test on the bike by turning the wheel possible to miss incipient bearing failure, because of the rim lever arm and rotational inertia,
    I havent yet owned a Ducati roadbike it would be possible to lock the rear wheels on even intentionally?? Suzuki may well have better rear brakes, you need to be careful it is not damaged gear wheels, (gearbox) if gear teeth have been shed its possible that the gearbox can lock but only with significant obvious damage
    This worries me, i would be worried not to know the problem was fixed? remember; bikes break, sometime fix themselves for short periods, but never-ever repair themselves? you have to do that; to make it safe again? looking forward to what you discover.
     
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