Author wobble at slow speeds  (Read 4547 times)

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  • Offline doctoras9

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      #10

    Offline doctoras9

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    Re: wobble at slow speeds
    Reply #10 on: 20 August, 2022, 10:14:28 am
    20 August, 2022, 10:14:28 am
    Hi
    What Rev Ken said

    Mine also wobbling 50-60km/h (when I take both hands off from handlebar) from the first ride years ago until today,  with 4 different pair tires during that period

    IMHO the phenomenon is due to hard engine’s brake, the weight transferred to the front wheel and cannot be absorbed smoothly by the soft front suspension, because of simple telescopic fork without any adjustment.
    Fatter sae oil fork, or aftermarket springs can help.
    But the solution would be to upgrade it to a closed cartridge, just like Andreani’s

    https://www.m4tuning.com/en/honda/220227-fork-cartridges-kit-misano-evo-andreani-honda-cbf-1000-105-h25e.html

  • Offline MexiCan

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    Offline MexiCan

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    Re: wobble at slow speeds
    Reply #11 on: 21 August, 2022, 11:48:09 pm
    21 August, 2022, 11:48:09 pm
    That's interesting. My issue does not seem to be at the handlebars. I feel it in my waist, as if the chassis was swaying left-right, making me want to correct the direction of the bike. Never noticed such thing until the recent bearing replacement. However, your idea is similar to my friend's, suggesting that stiffening the forks somewhat may help reducing the caster effect of the rear wheel. The price of the aftermarket part you referenced is steep and I'm sure they will charge an arm and a leg to send it to Canada, not to mention the invariable duties imposed by government.
    I am going to increase the afterload (or what ever the correct term is) in the front. Never touched it. Can someone tell me if I need to loosen the large nuts at top of the forks (fork cap) before I can turn the afterload screws?
    Thank you for your comments.
    M.
    Last Edit: 22 August, 2022, 12:07:13 am by MexiCan

  • Offline Art   england

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    Re: wobble at slow speeds
    Reply #12 on: 22 August, 2022, 08:29:49 am
    22 August, 2022, 08:29:49 am
    'pre-load suspension' is the term you're looking for and it is documented in the Owners Manual which, if not found on the underside of the pillion seat, you can download from here. If you're allowed spanners you may want to download the workshop manual while you're there.

    If you've checked the wheel bearings, swinging arm, shock absorber etc and found no play it might be an idea to check weight distribution in riding trim (complete with rider, pillion, luggage etc) which should be about 35:65 front to rear and no more than 980lbs (445Kg).

    Front end wobble is caused when the front suspension has too little of the load, rear end wobble is caused when the rear suspension has too little of the load. Neither should be confused with tank slappers which are caused when the rear wheel is rotating significantly faster then the front wheel and is trying to overtake it in circumstances such as drag strip style acceleration or when the front end drops out of a wheelie.
    Last Edit: 22 August, 2022, 09:02:06 am by Art

  • Offline MexiCan

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    • #13

    Offline MexiCan

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    Re: wobble at slow speeds
    Reply #13 on: 22 August, 2022, 05:07:00 pm
    22 August, 2022, 05:07:00 pm
    Thank you Art for the clarification. I did find the instructions regarding the fork cap. I will write an update after I adjust the preload.
    What do you mean by "if you are allowed spanners"?

  • Offline Art   england

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    Offline Art

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    Re: wobble at slow speeds
    Reply #14 on: 22 August, 2022, 06:16:09 pm
    22 August, 2022, 06:16:09 pm
    Some folk shouldn't be allowed spanners because they break more than they fix, worryingly if you need to ask you could be one of them ;-)

    /ducks for cover

  • Offline MexiCan

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    Offline MexiCan

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    Re: wobble at slow speeds
    Reply #15 on: 23 August, 2022, 01:24:21 am
    23 August, 2022, 01:24:21 am
    LOL. I'm not that bad!
    I figured it was some expression I was not familiar with. I have lived in Canada for nearly 50 years. Never heard this expression. :152:

  • Offline martins cbf1000   england

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    Offline martins cbf1000

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    Re: wobble at slow speeds
    Reply #16 on: 12 September, 2022, 05:39:09 pm
    12 September, 2022, 05:39:09 pm
    *Originally Posted by MexiCan [+]
    Will do, thanks. A friend suggested increasing the dampening of the front fork. He reasons that it will diminish the tendency of the rear wheel to caster. I guess that's a simple thing to try too.
    ride faster  :087: :169: :156: :007: :005:

  • Offline MexiCan

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    Offline MexiCan

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    Re: wobble at slow speeds
    Reply #17 on: 13 September, 2022, 05:05:04 pm
    13 September, 2022, 05:05:04 pm
    Geez, why didn't I think of that. Thank you. Problem solved! :046:
    However, and for those who might want more info about this: increasing the preload did nothing to the bike's handling. Given Art's concern about my mechanical abilities, I took the bike to another mechanic who determined that the bearing assembly was installed too tightly. He loosened the thing with improvement. However, I still have some trouble making the bike follow a path in a tight curve and it remains rather susceptible to turbulence from trucks and vans (which was never a significant issue before). Not sure what to do next short of giving up on the bike.

  • Offline jm2   england

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    Offline jm2

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    Re: wobble at slow speeds
    Reply #18 on: 14 September, 2022, 06:46:41 pm
    14 September, 2022, 06:46:41 pm
    You need a better mechanic.

    Bring it down to me at the end of November, just head SSW (IS95/IS75 if you want).  I'll only be 500 odd miles from you and that's by far the closest I'll be this year.

  • Offline MexiCan

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    Offline MexiCan

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    Re: wobble at slow speeds
    Reply #19 on: 15 September, 2022, 12:17:55 am
    15 September, 2022, 12:17:55 am
    Nice offer jm2, however, I am actually 3300 mi from you (on the other side of the Atlantic). Any suggestions as to what to do mechanically?