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Thread: Clunking/Thunking Front End........

  1. #1
    '92 R100GS '81 R100/t brittrunyon's Avatar
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    Clunking/Thunking Front End........

    Anybody have ideas of what could be the problem?
    Listen & you will hear a noticeable "thunk", both down & up.
    For me it sounds/feels like it's in the upper portion of the fork tubes.........
    I can really feel it on the triple tree............not down low.............

    https://vimeo.com/41179450
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  2. #2
    Registered User toooldtocare's Avatar
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    May be time to inspect the insides of the forks. My RS did that too until they were rebuilt.

  3. #3
    '92 R100GS '81 R100/t brittrunyon's Avatar
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    Does this make viewing the vid of my problem easier?
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  4. #4
    Registered User toooldtocare's Avatar
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    Not the same as my clunk. Mine did it only at the extremes.

  5. #5
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    Almost sounds and looks like, the back end of your front fender is hitting the red crash bar ???

  6. #6
    Registered User 88bmwjeff's Avatar
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    Check your top plate. When they are loose, they can have a clunking sound too.
    Jeff in W.C.
    1988 R100 RT (the other woman)
    "I got my motorcycle jacket but I'm walking all the time." Joe Strummer

  7. #7
    Administrator 20774's Avatar
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    Get one of those mechanics stethoscope and put it at various places on the front front from the brake all the way to the top plate. Then see where the sound is really the highest.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    Huckleberry, Gilera &Toad kstoo's Avatar
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    Check steering head bearings for play, though I don't think so in this case.
    While we're on your videos ... I love that "few pieces of toast" one!
    1980 R100T (Gilera), 1982 R100RT (Toad), 1975 R60/6 (cern?¡calo)
    Adventures at the Cave

  9. #9
    '92 R100GS '81 R100/t brittrunyon's Avatar
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    I did the steering head bearing last Fall, before riding to The Darian Gap.
    They seem OK now, tight, etc.
    Glad you enjoyed the video! We had fun shooting it and coming up with inventive camera angles.
    https://vimeo.com/user2721333

    I ordered a stethoscope to better diagnose.

    The top plate is tight.

    I'm fairly busy right now, but should be able to trouble shoot some more this week.
    Thanks for all the input!
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  10. #10
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    Please keep us posted on the outcome !!

  11. #11
    Simpleman
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    That seems like an excessive amount of front dive I would check the fluid level and maybe go to a heavier weight fluid?????

  12. #12
    '92 R100GS '81 R100/t brittrunyon's Avatar
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    I WISH I HAD TAKEN PHOTOGRAPHS!

    I drained the fork oil in both right & left fork tube today.
    The oil, with only 3k miles on it looked like used engine oil. With a flashlight I could see "shiny" metal particles.
    The right fork tube oil actually had at least one larger piece of metal (the size of a flea) in it.
    I guess this is a bad sign?

    So what NOW?

    1. I will pull the forks
    2. Order Progressive Springs
    3. Emulator ?

    I want to "upgrade" the front end.
    ..................................................
    Last edited by brittrunyon; 05-01-2012 at 12:05 PM.
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  13. #13
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    Upgrading the suspension is like telling an engine builder to make you a fast motor. How fast do you want to go ?
    How much do you want to spend.

    All depends on your budget and how you use the machine IMHO.

    What ever you decide , it will be a big change from stock.

  14. #14
    '92 R100GS '81 R100/t brittrunyon's Avatar
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    I'm thinking the springs are "tired", and replacing with progressive springs would be a good idea. Perhaps a set of Wilbers?

    As far as adding an emulator ...... Im searching the forms on the why?, what?, and how much?

    How I use the machine?

    I ride the forest roads of Northern New Mexico for giggles & grins, but not the really serious single track. I ride 2 up and loaded (not that one) through the Desert SW, Central America 4 times in the last 8 years.
    1992 R100 GS, 1981 R100/t, 2007 F 650 GS

    No Rules Photography at http://brittrunyon.com/
    My riding videos @ http://vimeo.com/user2721333/videos

  15. #15
    Unfunded content provider tommcgee's Avatar
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    I ride the same kind of roads as you. Add a vote for "I hate progressive rate springs" -- get straight rate. The Ricor Intiminator or RaceTech Emulator valves are great upgrades for damper rod suspensions. I prefer the Ricor because you don't have to futz with it as much, just drop it in and ride.
    Salty Fog Rally 2007, 2009, 2011, 2012, AND LOOKING FORWARD TO 2014!

    -Tom (KA1TOX)

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