Slow speed vibration on deceleration

Discussion in 'Parallel Universe' started by JJJZJ, Mar 28, 2011.

  1. JJJZJ

    JJJZJ Been here awhile

    Joined:
    Sep 21, 2008
    Oddometer:
    188
    Location:
    On The Road
    I cant get the search to work here, but has anyone ever run into the problem I am having where their bike(mine is a 2010 F800) develops a slow speed vibration on deceleration? It seems to occur from 25mph - 18mph. I can feel it run through the entire bike. It has me slightly worried that the problem might the wheel bearings possibly as I am slightly paranoid thanks to this forum:cry

    It might occur at acceleration, but I cant tell with the engine doing its thing...

    Initially I thought it might be the tires I put on, but it feels more pronounced as time goes on. Its not bad to live with, but I just want to avoid catastrophe if possible. The bike has about 12k miles on it right now.

    Thanks for any ideas!
    #1
  2. OldPete

    OldPete Be aware

    Joined:
    Oct 6, 2007
    Oddometer:
    9,511
    Location:
    SoSoCal
    Just a thought.
    I've had several bikes do this but at a slightly higher decell speed, 45-20.

    Carefully try this.
    With a very, very light hold of the hand grips... Is the steering head shaking upon decell?

    If so, adjust or replace the steering head bearings.
    If the stock bearings are ball, replace with tapered roller if avalible.

    Inexpensive bearings are sourced from China, like all balls.
    Use quality bearings like USA, German, etc. sourced.
    #2
  3. johnparjr

    johnparjr Been here awhile

    Joined:
    Mar 7, 2010
    Oddometer:
    203
    Location:
    Roseville
    Mine does that on my new shinko's from 20-25mph then goes away for me I just figured it's the block pattern on the tires.
    #3
  4. JJJZJ

    JJJZJ Been here awhile

    Joined:
    Sep 21, 2008
    Oddometer:
    188
    Location:
    On The Road
    I cant remember if mine did it with the stock pirelli scorpion tires, but i have Shinkos on there currently as well. I think they are the 705s?
    #4
  5. bloochdog

    bloochdog Itinerant jackass

    Joined:
    Jan 12, 2006
    Oddometer:
    6,219
    Location:
    I cover the waterfront in Norfolk Virginia.
    My 800 tended to have that deceleration vibration ending in an increasing front wheel wobble. It seemed to worsen when heavily laden and with top box.

    Tangohopper's R1200gs adventure does the same thing.
    #5
  6. CheckerdD

    CheckerdD Long timer

    Joined:
    Apr 30, 2005
    Oddometer:
    1,431
    Location:
    Dave Rankine, Reno NV
    Put the bike up on the centerstand; add enough weight to the rear wheel to lift the front tire/wheel off the ground and spin the wheel. Does the wheel, tire or brake rotor seem to wobble. That can point to the one causing the problem Re the steering head bearing, in my experience is unless it gets notchy if you slowly move the bars side to side, with the wheel up, it's something else.

    Note if the tire is out of round that ought to be visible when spinning the wheel. I have never had a new tire go out of round, but I never bought one made in China either. Dave
    #6
  7. johnparjr

    johnparjr Been here awhile

    Joined:
    Mar 7, 2010
    Oddometer:
    203
    Location:
    Roseville
    Shinko's are S Korean not Chinese:deal
    #7
  8. Tosh Togo

    Tosh Togo Long timer

    Joined:
    Nov 21, 2010
    Oddometer:
    1,594
    Who cares?...the bike's German. :deal

    The way thngs are going, it'll be a part of southern China in a few years anyway. :eek1
    #8
  9. swimmonkey

    swimmonkey JMS

    Joined:
    Oct 22, 2008
    Oddometer:
    54
    Location:
    Austin, Texas
    Have the same thing when I run TKC 80's. When I run Metzler Tourance, it goes away.
    #9
  10. KuRi

    KuRi Adventurer

    Joined:
    Oct 23, 2010
    Oddometer:
    23
    I have a similar problem on mine. I notice it too when keeping the speed at ~20km/h, with a very small gas usage.

    The thing is that I notice it only on the left side of the bike :(
    #10
  11. johnparjr

    johnparjr Been here awhile

    Joined:
    Mar 7, 2010
    Oddometer:
    203
    Location:
    Roseville
    Mine is starting to fade so Im assuming it's the block pattern of the tire which is now getting worn down after 800 or so miles the vibration is almost gone.
    #11
  12. johnparjr

    johnparjr Been here awhile

    Joined:
    Mar 7, 2010
    Oddometer:
    203
    Location:
    Roseville
    Because everyone likes to Bash shinko tires even though they have probably never had a pair on.
    #12
  13. JJJZJ

    JJJZJ Been here awhile

    Joined:
    Sep 21, 2008
    Oddometer:
    188
    Location:
    On The Road
    They were cheap and there are so many mixed reviews on here that I gave them a whirl.
    3500 miles later with a trip to Baja and rear ending a chevy pickup under their belt with no flats or failures, Im sufficiently impressed.

    Wish I could say the same for those junk ass Pirelli(read: fancy Italian) tires that came on the bike.

    Ill keep an eye on the vibrations, but will just assume its due to the tires tread pattern.
    #13