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R6 track bike vibrations

Discussion in 'Tech' started by Brutal, Oct 13, 2020.

  1. Brutal

    Brutal Well-Known Member

    I have a track bike that seems to have a very fine vibration, changed chain and tightened the headstock bearing but still really bad?

    It get seriously bad when going through the twisties in 3rd-4th gear at 12k-16k rpm

    Any help appreciated.
     
  2. DBConz

    DBConz Registered Idiot

    any idea where the vibration is coming from? do you feel it in your hands, tank, feet, etc.
    are you sure the rear wheel is aligned properly if you changed the chain?

    checked the steering head bearings?
     
  3. MELK-MAN

    MELK-MAN The Dude abides...

    i'm simply overwhelmed by the sheer volume of info given to diagnose such a problem ... :cool:
     
  4. pscook

    pscook Well-Known Member

    RPM dependent = Engine

    Speed dependent = Chassis
     
    MELK-MAN likes this.
  5. Brutal

    Brutal Well-Known Member

    It's a high frequency vibration that I think is speed dependant, I'll try the headstock bearing and see if that makes a difference, the vibration can be felt all the way up my ass and through my inner thighs.

    An even bigger issue that came apparent at jerez was the inability to hold a constant throttle or get on the gas easy when coming out of the corner without it stuttering and feeling like it was cutting out, only seemed to happen when hot and never when WOT
     
  6. stangmx13

    stangmx13 Well-Known Member

    Random ideas:
    - bent wheel
    - out of balance or out of round tire
    - bad wheel bearings
    - out of round or bent sprocket
    - loose chassis bolts like subframe, engine, etc

    Based on super limited info here, I think the last is most likely. The rest are ez to rule out either way.
     
    Last edited: Oct 16, 2020
  7. pscook

    pscook Well-Known Member

    If you feel it in the seat, then it's really likely not headstock bearings. I had a broken clutch basket that I swore was an out of balance wheel because the vibration was only apparent at speed. However, it turned out that the vibration was worse at high RPM/high load, which is experienced going down the straightaway.

    Another consideration is your fuel maps or something in the injectors/EFI system. A misfiring cylinder (plugged injector or bad spark plug) can cause high frequency (or even low frequency) vibrations, and a misfire can also cause poor low throttle opening issues.

    I suggest a trip to your local dyno operator for a full load/high RPM analysis.
     
  8. Brutal

    Brutal Well-Known Member

    For anyone interested I believe I've found the issue to be a rough wheel bearing in the rear wheel.
     
    DBConz likes this.
  9. TurboBlew

    TurboBlew Registers Abusers

    the cush drive needle one?
     
  10. Brutal

    Brutal Well-Known Member

    Its the one on the disc side man, rough as fcuk!!
     

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