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A weird, repetitive sound...came out of nowhere and became worse.

Discussion in 'General' started by Irish Viking, Jul 5, 2018.

  1. Irish Viking

    Irish Viking Till Valhalla!
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    Hi all,

    So, my wife and I went out for a long ride today - about 7 hours.
    On our way home, as we were descending out of the mountain roads, I began to hear a sound that was not present before. Now, just fro clarification - II am partially deaf and cannot hear very well as it is - so my description of this noise may not be in line with how someone else might describe it to sound like, but I will do my best.

    I first noticed it at lower speeds and in lower gears. The sound would disappear as speeds increased and after shifting up into higher gears. Rolling at 50-75mph, I could not hear it at all.

    To me, it sounded as if the sound came from the front, chin area of the bike...down low. The only way I can describe it would be a deep, woomp, woomp, woomp, woomp...with kind of a metal bass tone.
    The sound came on slowly and was barely noticeable at first. After about 50 more miles, it progressively became worse. When I was back in town, I brought the bike up to about 40mph, then released the throttle and pulled in the clutch - and that is when it sounded the loudest and clearest. Woomp, woomp, woomp, woomp...and as the bike slowed down, so did the sound, the rhythm rate and the volume level of the sound.

    No smells, no wobbles, nothing else going on.

    Based on where it sounds like this sound is coming from, I originally thought it was from inside the engine itself. After returning home and thinking for a while, I thought maybe the front wheel bearing...?

    Any thoughts or similarities?

    Thanks!


    Liam
     
  2. woodbutcher

    woodbutcher Mr. Old Fart member #145
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    how many miles and, to your knowledge, have the bearings been changed. original bearings were not that great. (jap)
     
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  3. SKOGDOG

    SKOGDOG One of the old ones.
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    Your description seems to say the sound varies with the speed of the vehicle, not the engine rpm's-right? If you were going 20 mph in 1st and shifted to 2nd and still stayed at 20 mph, would the sound change?
    So Maybe it's wheel bearings as Woodbutcher suspects, or maybe a tire issue.
    The other thing that can make noise that varies with the speed of the vehicle but not the engine would be the final drive belt, but that is not in the area you describe, and it doesn't typically have a metallic sound.
     
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  4. Sven

    Sven Well-Known Member

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    Run the engine up into 2nd, wind it out so you are over the 20mph range, kill the engine, find N, let the clutch out... now the engine is out of the loop. The woomp-woomp is narrowed down to the chassis and its hangers/parts/etc. Clutch in and engine idling still covers or is the noise. Eliminate the engine rotation, rather, chase tire bubbles/wheel bearings/drive chain whaa-whaa (if applies).
     
  5. Irish Viking

    Irish Viking Till Valhalla!
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    It's a 2010 with almost 6K miles...and to my knowledge - bearings have never been changed.
     
  6. Irish Viking

    Irish Viking Till Valhalla!
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    Alright...I will do that and report back - see what happens.
    Thanks!
     
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  7. dentdude36

    dentdude36 Banned

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    I’m with these guys hen I had my pitbull I noticed grease after ever ride on the wheel shims but wheels had no slop and were not noisy when spun on the jack, shortly after I took it in for new tires and bearings and low and behold one of the bearings was blown apart the certified BDM tech that worked on it said he never seen a wheel bearing that bad. If you replace the bearings yourself or st a shop make sur you pop the seals off and add grease ther is barely any in them when you get them
     
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  8. Irish Viking

    Irish Viking Till Valhalla!
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    If I ends up being the bearings, what brand do you recommend and can I get them form Donna and Derek?
     
  9. dentdude36

    dentdude36 Banned

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    Donna and Derek do have them but as I mentioned regardless put more grease in them no matter wha brand
     
  10. woodbutcher

    woodbutcher Mr. Old Fart member #145
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    reason for less expensive bearings at time of production is partly availability and the rest the fact that the good ones cost 3-4 times more and aren't that much better any more. skf or timkin used to be good, but not so much anymore. good advice on more grease.
     
  11. TapioK

    TapioK Well-Known Member
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    Not so sure about adding grease.
    The guys I know who have done their working years around bearings say adding grease is the best way to make modern bearings overheat and break... I personally have no idea.
     
  12. Mr. Wright

    Mr. Wright Guru
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    :agree:
     
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  13. dentdude36

    dentdude36 Banned

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    Certified big dog tech adds grease and I believe Eric mentioned it a while back that he also adds grease to the bearings, I’ve personally seen the new bearings with next to no grease in them :2cents:
     
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  14. BWG56

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    In past years when working on the front brakes of cars I was always packing the bearings with grease. And now with the trailer axels and the easy lube feature, the bearings are fully packed with grease until the grease pushes back out around the grease gun nozzle. I've towed the trailer at 70-80mph for 14-16hrs straight at those speeds and never had a bearing failure from over heating because of too much grease.
     
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  15. pauly

    pauly Active Member

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    Quote from Internet:

    Lubricant quantity is a factor in overheating. Excessive lubrication can cause a condition called churning, leading to a sharp temperature rise in all but exceptionally slow-speed bearings.

    The wheel bearing do not spin fast.

    Paul.
     
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  16. dentdude36

    dentdude36 Banned

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    I get that but what about under lubrication the certified big dog tech I’m speaking of has seen new bearing failure in under or around 100 miles of replacement
     
  17. BWG56

    BWG56 Guru

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    18" wheel with tire is about 786 RPM @60 MPH
     
  18. pauly

    pauly Active Member

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    Both are no good but I'd rather over grease my wheel bearings which should not
    do any harm since they do not spin very fast.

    Paul.
     
  19. SimpleMan_Omen

    SimpleMan_Omen Active Member

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    https://www.vxb.com/
    I got my bearings from here. Good company to deal with and they carry good quality stuff and cheap stuff so you can get what you like. But good bearings are cheap enough. The code for the bearing size is on the side of it and is easy to see when you take them out.

    Then Motorcyclist magazine told me how to change them and it was easy. Changed my front and rear with little effort and no special tools.
    <iframe width="1903" height="789" src="" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
     
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  20. Mr. Wright

    Mr. Wright Guru
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