Handlebar and front wheel strong vibration

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by andresg, Aug 25, 2012.

  1. andresg

    andresg Adventurer

    Joined:
    Aug 6, 2010
    Oddometer:
    23
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    Guatemala
    Hey Guys,
    I have my 950 adventure '05 but lately I've had a lot of vibration in the front wheel.
    When I raise my hands off the handlebar between 10Km/h and 60Km/h, the Adventure goes steady as well between 75Km/h and up.
    But between 60Km/h and 75Km/h the handlebar just becomes a whole vibration w/out control at the point that could make me fall and crash.

    Specially goes worst off-road when in bumps when the front wheel goes up and touches ground again.

    Does anybody have had a similar experience? Do you know what could cause this problem and how to fix it?

    Thanks guys.

    Andres
    #1
  2. Stumpalump

    Stumpalump Been here awhile

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    Feb 12, 2010
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    128
    Put it on the center stand and spin the front tire. Look for a tire problem or bent rim first.
    #2
  3. GrenDesb

    GrenDesb Been here awhile

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    May 6, 2011
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    333
    Location:
    Québec
    Front tire

    Suspension setup

    Head bearings

    ...

    ...

    Common sources of front end shake
    #3
  4. Chewy750

    Chewy750 Adventurer

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    What tyres, part worn scorpions cause this.
    #4
  5. bigkuri

    bigkuri Long timer

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    Oct 31, 2004
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    Location:
    London, but am a Kiwi
    +1

    Actually I find part-worn pretty much anything causes this, especially if I've been road riding and heavy on the front brake.
    #5
  6. andresg

    andresg Adventurer

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    I have a part worn Scorpion front tire, however the problem appeared after installing the brand new...
    I got it balanced but didn't work-out.
    #6
  7. GrenDesb

    GrenDesb Been here awhile

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    Did you made any changes other than the tire?

    If not, it must be the tire.

    What's the air pressure in it?
    #7
  8. andresg

    andresg Adventurer

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    None, just the tire.
    I normally use 28 -30 psi front...

    Tomorrow I'll change the rim for a new one from Behr, move the hub, discs and spokes, get it all balanced and see what happens...
    I'll check suspension bars torque, triple clamps and wall-nut again, so far those where correctly tightened though.

    :uhoh
    #8
  9. Yascher

    Yascher Been here awhile

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    Moscow, Russia
    mine does this from worn scorp, uder braking bike just starts to wonder all over the place+wibes
    #9
  10. Wastedavid

    Wastedavid Adventurer

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    Oct 27, 2013
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    Any other solution to this problem??? My bike has new tires, actually is brand new... I guess there are no worn tires or parts on my bike but it's exactly the same problem, between 60 to 80 Km/h if you don't hold the handlebar strongly... kiss the road
    #10
  11. gefr

    gefr Life is a trip

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    I had worn wheel bearings and the result was wobbling of the front wheel.
    You could sound- check the spokes. I had one broken once...
    Cheers.
    #11
  12. ADVill

    ADVill Been here awhile

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    West Tn, USA
    Scorpion. Stand up, lean forward and look at the tire while it's rolling. Looks like a wheel out of true. Can't wait to get mine off.
    #12
  13. DesertSurfer

    DesertSurfer Tail sprayin

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    This same post appears year in and year out. The 950 stock front springs are soft and causes a dive to the front end. The front Scorpion wears unevenly due to this dive and the weight imposed on the front wheel. The Scorpions along with the Behr front wheel don't balance well either. Also the Scorpions do not wear well with tire pressure below 32 psi on pavement. Add all of this up and you'll constantly hear complaints about "head shake".

    I"ve experienced this very same problem with fairly new Scorpions and pitched them immediately... problem solved.

    My personal opinion of the Scorpions are they suck anyway. I'd rather ride an extremely worn set of TKC80s on the pavement.

    Now, my current Scorpion Rally front tire is working really well and would also make a much better selection.

    But then I'm of the belief it's better to have a more aggressive tread pattern then a lesser one. And an extremely worn out aggressive tread pattern is as good to me as a worn out street tire... where bald is bald.

    Just my humble and biased personal op. YMMV.
    #13
  14. Wastedavid

    Wastedavid Adventurer

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    Hi guys! I was reading this and I´m worried about this because my bike is brand new, 3500 km and it has this terrible vibration between 50-75 Km/h and some days ago I was trying to fight with a S Teneré 1200 and a Vstrom 1000 and when I was reaching 190 Km/h, the bike was going from one side to another, very strange but I got scared and preffered to release accel and see the other guys leave me behind...

    I have to check if maybe the problem is the rim but I really don´t think so...

    Let´s see what´s going on
    #14
  15. superhak31

    superhak31 Adventurer

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    First off, don't replace Behr rim with a Behr Rim. Get an Excel or Dirtstar DID.
    1.85" way stronger than stock wheel. And costs less. And I put in stiffer front springs to avoid bottoming out while off road. No front shake ever.
    #15
  16. AB13

    AB13 Long timer

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    Try adjusting the steering head brgs. AB :D
    #16
  17. keener

    keener Speed changes you.

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    +1
    #17
  18. Dogtown

    Dogtown Been here awhile

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    OK... there is lots on this in here but let me tell you how it does and doesn't occur in my 990.

    It is mostly how I have my 990 loaded that causes any wobble/vibration. It will be fine unloaded but then wobble with boxes and a load in the boxes....and then fine again with the wife on top of it all. there are a few variations to that but for the most part always how I load the bike! SO, For me it only wobbles when my rear suspension is at a certain travel position.
    From my knowledge of this issue it comes from the REAR suspension but shows up in the front.

    If its doing it with nothing on the bike load it with gear or a passenger and see if it goes away. If it does then you just need to adjust your rear suspension. It might even be as simple as adjusting your preload adjuster.



    Cheers!
    #18
  19. ajak117

    ajak117 Adventurer

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    Jan 2, 2014
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    ive also had this issue from multiple sources on my 990adv. the first was from having and excess of weight hanging off the luggage rack, this causes the front to raise up a little bit also giving head shake. and two have improperly balanced tires, i found that improper balanced tires wont really give you bad shake a low speeds but it really affects higher speeds.
    #19
  20. KaytM

    KaytM Just a fella.

    Joined:
    Aug 13, 2011
    Oddometer:
    235
    Location:
    Aberdeen, Scotland.
    +2
    I had the shakes and put her in for the large service and she came back peachy (orangey??).
    That said I had new rubber and wheel balancing too so perhaps that was a contributing factor.
    My gut says head stock bearings.
    #20