2016 - T120 Wobble At Speed

Discussion in 'Technical Help' started by Alectron, Jun 10, 2019.

  1. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #1 Alectron, Jun 10, 2019
    Wheel alignment, head bearings and tyres all good but now experiencing a quite alarming side to side wobble of the bike at high speed, not tank slapping or any noticable movement at the bars.
    Has anyone ever experienced this or similar please.
    Any suggestions will be appreciatedo_O
     
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  2. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #2 Alectron, Jun 10, 2019
    Thanks for that. I put Avon Storm's on last year and they're great!
     
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  3. Tricky-Dicky

    Tricky-Dicky Crème de la Crème

    Dec 12, 2016
    2,441
    1,000
    Norfolk UK
    #3 Tricky-Dicky, Jun 10, 2019
    Also check fork oil levels as uneven damping can cause some funny effects.
     
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  4. sprintdave

    sprintdave Nurse, think it's time for his medications.
    Subscriber

    May 25, 2014
    1,643
    750
    Birmingham
    #4 sprintdave, Jun 10, 2019
    Front wheel out of balance , wheel bearing going?
    How did you check wheel alignment, the marks on the swinging arm may not be correct, check using other means
     
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  5. Tiglet

    Tiglet Vintage Member

    Mar 28, 2016
    4,434
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    Cheshire
    #5 Tiglet, Jun 10, 2019
    Have you lost a balance weight off the wheel
     
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  6. stevethegoolie

    stevethegoolie Elite Member

    Oct 16, 2014
    2,456
    800
    East Riding of Yorkshire
    #6 stevethegoolie, Jun 10, 2019
    Tyre pressures??
     
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  7. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #7 Alectron, Jun 11, 2019
    Many thanks for all your comments.
    Fitted a new DID gold chain late last year and always measure wheel position before and after with a ruler.
    Front wheel bearings are good and tyre pressures spot on, that's why I'm puzzled by this. However, wheel balance weights?
    The bike runs perfectly until we go over normal UK limits! I could comfortably go well over 90 or so (on autobahns etc) without any problem.
    Now this alarming sideways wobble starts before these speeds are reached!
    Thanks again for your comments
    A
     
  8. capt

    capt Elite Member

    May 8, 2016
    3,052
    750
    western Australia
    #8 capt, Jun 12, 2019
    How old/worn is your back tyre ? I've found some times the wear can cause the tyre to run up the camber of the road and slide back down again. Try putting a few pounds more air in the rear tyre , if this relieves the symptoms all good, if it continues then the front has worn unevenly , front will feel like a ripple strip, replacement only option
     
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  9. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,362
    800
    Nr Biggar
    #9 Callumity, Jun 12, 2019
    I know people like their alignment pointers and swingarm markings but every chain driven bike that I have owned has been aligned with string along the wheels for a base setting. It resolves any misalignment in engine etc.

    You need to allow for differing tyre widths fore and aft. Fishing line!
     
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  10. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #10 Alectron, Jun 12, 2019
    Sounds good Culamity, thanks for that.
     
  11. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #11 Alectron, Jun 12, 2019
    Callumity!
     
  12. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #12 Alectron, Jun 12, 2019
    Thanks Dozers Dad. As far as brake pads are concerned, have you noticed how the inner and outer (front) seem to ware away uneven. Inner one first which is in contact with the disc immediately, outer quite a lot less ware.
    Just thought you might have seen this?
    Think it's worth reversing them to even out!
    Thanks
     
  13. Alectron

    Alectron Well-Known Member

    Apr 26, 2018
    112
    93
    Northumerland
    #13 Alectron, Jun 12, 2019
    Oops, wear not ware!
     
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