Africa twin "clunk" over small bumps. Bumot or center stand?

Discussion in 'Land of the Rising Sun: ADV Bikes from Japan' started by nixter, Jul 14, 2017.

  1. nixter

    nixter Adventurer

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    So I noticed a bit of a clunk noise when the bike hits a small sharp bump like a recessed man hole cover or similar. Im thinking it's either the Bumot bash plate's lack of rubber mounting grommets, or the center stand bouncing. Anyone with either or both of these pieces noticed similar? Just haven't had the time to diagnose properly and I leave for a two week ride tomorrow. If I can't sort it tonight I might have to try and figure it out on the road.

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    #1
  2. Copracer288

    Copracer288 Adventurer

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    I have the same noise. I have an SW-Motech bash plate and center stand. I tried zip-tying the center stand up but I still have the clunk.
    #2
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  3. nixter

    nixter Adventurer

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    Interesting. I was actually going to try zip tying the center stand as well. I probably will anyways. Any other thoughts about what it might be?

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    #3
  4. atctim

    atctim Big Red Pig Farmer

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    Mine has done it since new with no mods. I once thought it was the chain cover. I can not for the life of me locate it. I usually only hear it on the trails, hardly ever on the road, unless it's a washed out dirt road.
    #4
  5. nixter

    nixter Adventurer

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    Hmm. I hear it on the road all the time so it's possible we have two separate issues. I haven't had it off road since I started noticing it. Small drops nearly always produce it.

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    #5
  6. rve123

    rve123 Adventurer

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    #6
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  7. tremor38

    tremor38 Long timer

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    Every post you make doesn't have to be a new thread, Nixter.

    Do you have a dresser? Does it have drawers? Do you use the drawers to group like types of clothing, or just stuff it all in hither-tither?

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    #7
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  8. nixter

    nixter Adventurer

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    Are you saying I should ask in one of those massive, "Africa twin issues" threads that meanders all over the place? To me, that's a huge drawer with way too much stuff in it. I like email notifications of replies. If I post in a massive thread then I get all kinds of notifications that have nothing to do with my post.

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  9. mkn

    mkn Been here awhile

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    It's chain slap don't worry about it it's a well known issue i zipped tied my center stand still did it. I had my friend stand by as I dropped off a curb and he said the chain hit right when the noise happened. It's just part of the deal with the AT I was a bit annoyed at first but I have learned to live with it now after 10,000 miles on the clock it doesn't bother me.
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  10. nixter

    nixter Adventurer

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    Interesting. If that was the case, it's weird I never noticed it at first. Anyhow I zip tied the center stand this afternoon and didn't notice it riding home but that wasn't too far. We'll see tomorrow.

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    #10
  11. Copracer288

    Copracer288 Adventurer

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    I only hear mine on trails also. Never noticed it on road.
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  12. Motociclo

    Motociclo Without motion, nothing.

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    Straya!
    My twin in the past, clunked from forks. Rebound was to weak to control spring.
    Just my 2 cents.
    #12
  13. Drif10

    Drif10 Accredited Jackass

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    Chain slap?
    #13
  14. PaydayGabe

    PaydayGabe Semi Retired Senior bike junkie

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    Yeah, chain slap? Doesn't that fine machine have a chain guide/ slider thingy on top of the swing arm?
    Check your steering head bearing adjustment. Could be a shade loose from break in. Also a great time for some fresh grease in those bearings. You know how the factory is. :csm
    #14
  15. arcgotic

    arcgotic Adventurer

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    Can it be that steering head bearings are done?

    later edit: :) haven't read the post above.. damn..
    #15
  16. Copracer288

    Copracer288 Adventurer

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    The noise I hear is definitely not steering head bearings.
    #16
  17. PaydayGabe

    PaydayGabe Semi Retired Senior bike junkie

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    Here's my reasoning. From past experience, and Just a thought to possibly help you find your issue.
    Purchased an old Yamaha TDM. Really great shape. Almost 50k miles. When I would ride around town I would get a random" KNOCK" sound ONLY when I would ride over a sharp edges type hole or a speed bump:hmmmmm. What the Hell is going on?
    Drove me bonkers. Couldn't feel any forward/rear play in the forks w/ the front wheel raised? Man ! ? Could the inner fork bushings be sacked? Don't know.
    So , I'm thinking , this sounds like major surgery? And $$$. Anyway, as I lower the front wheel back to the floor I barely place any weight on the whole front assembly. Barely, , kinda like its floating. I grab the front wheel and give a push forward/rearward shimmy. Motherf%@ker there it is:clap. Oh the joy. :happay
    Damn head bearings! Talk about a fluke!
    Long story short, it was major surgery and $$$, bike had almost 50k on it. It was time. Head bearings were shot, forks got a complete rebuild as well as the front calipers:doh.
    This was my experience, , just giving you folks food for thought . Not trying to cause a panic:dirtdog. Good luck with your search.
    G, in Vegas .
    #17
  18. seancampbell

    seancampbell Been here awhile

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    Chain slap is caused by the chain hitting the plastic chian guide/ swingarm protector on the forward part of swingarm.

    Place a bead of Silicon under guide to reduce noise.
    #18
  19. King of Beers

    King of Beers Adventurer

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    Are you talking about the upper chain guard that goes above the chain and over the rear sprocket? I have removed this guard and I still have this slap. It does not bother me... to much... and I consider it normal. I do not know, however, precisely what is happening to cause it.
    #19
  20. King of Beers

    King of Beers Adventurer

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    Are you talking about the rubber swing arm protector that goes in between the chain and the swing arm that is located at the swing arm to frame joint? Unbolt it from the swingarm and put a bead of silicone on it and bolt it back on?...

    Sorry about the two posts...
    #20