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Thread: tricks for handlebar vibration

  1. #1
    jimmy armour
    Join Date
    Jul 2009
    Lucknow ontario canada

    tricks for handlebar vibration

    Hi guys hope all are well, just replaced the bars on my 1977 r100s/rt for slightly lower and further forward seem comfy, so was wondering what can bee done to reduce handle bar vibs, ? the old rt bars would vibrate also wheel ballance etc fine, was told to fill bar with silicone and let it solidify! to deaden the vibs what do you guys think,bye for now keep safe Jimmy

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    San Antonio, TX
    Is it a high frequency buzz or something more like a road induced vibration? Is it only at one RPM or the whole time? That's a bit unusual to have the bars vibrate on a /7. I would be sure that the mounts are solid. There was a discussion on a K100 where the bar snake was suggested.
    Kurt -- Forum Liaison ---> 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!

  3. #3
    Registered User Anyname's Avatar
    Join Date
    Jun 2007
    Portsmouth, NH
    When I swapped the tall stock RT bars on my R80 to lower bars (K75C bars), I picked up a lot of vibration. I assumed it was the bars, so I bought some R90S bars. Same issue. Swapping back to stock bars fixed the issue. Then for some reason, I decided to re-install the R90S bars and swap to shorter throttle cables. The vibration went away. Apparently the long cables looping around caused the carbs to be out of balance. I dunno why, the long cables worked smoothy and they seemed to return to idle properly. If you new bars are low enough for the short cables, it may be worth a try.
    BMW R bike rider, horizontally opposed to everything...

  4. #4
    jimmy armour
    Join Date
    Jul 2009
    Lucknow ontario canada

    thanks everyone

    well felt I should answer before this falls off the page just fitted the new bars EMCO aftermarket they are just what I wanted, I have now cut the ends off 1.5 inches on both sides to make them the same length as the BMW RT bars also slipped a lenght of rubber tube inside the bar and reinstalled my aftermarket bar end weights, so all seems good now thank you to those who tried to help, I always knew what I was going to do but wondered if there was any new tricks worth trying ,guess not again keep well and safe Jimmy
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  5. #5
    Curmudgeon nrpetersen's Avatar
    Join Date
    Sep 2004
    minnetonka mn
    Does this vibration just happen at speeds you usually cruise at? Theoretically you can shift natural frequencies by adding mass and/or stiffness or you can reduce them with added damping. Mass and stiffness are about the only things available to most situations, and they only have a square root effect. Damping is something that rarely can be accomplished by us mere mortals and especially to a level that solves a problem.

    Silicon plugs inside a handlebar will only add mass and virtually no damping to a resonance.

    BTDT many times. Go after the source - if that's possible.

    A structural engineer - retired
    Retired w 2005 K1200LT, 2000 R1100RT, & 1975 R90/6

  6. #6
    Registered User lkchris's Avatar
    Join Date
    Mar 2003
    Albuquerque, NM
    Trick #1: tune up. Carb synch.

    BMW twins don't vibrate. When they were expanded to 1000s, they began to provide massage.
    Kent Christensen
    '12 R1200RT, '02 R1100S

  7. #7
    Registered User beemerguru's Avatar
    Join Date
    Mar 2003
    Foster City, CA
    As said above...airhead vibrates, first check the valve clearances, then cable free play, then warm up ride, then balance the carbs..that solves most vibration issues...even in the handlebars

    If it's an R100 and you REALLY want a smooth machine; next time you do a top end job take the time to balance the rods, pistons, and wrist pins side to side. I've had as much as 8grm difference when the engine swallowed a valve and ruined the side..and the owner replaced the piston/cylinder with an Ebay special to get it back on the road...could make a milkshake while riding. Finally got it balanced and smooth as a different engine.
    Greg Hutchinson
    R80G/S (4) 633CSi with 450K mile
    '68 R60/2 '88 K100RS Special Edition

  8. #8
    Some aftermarket heavier bar end weights smoothed out the high frequency vibes in my RT.
    R. Reece Mullins Ebony R1200RT (Gretchen)
    MOA # 143779
    MOA Charter Club #5 #364 #100
    BMW MOA Vice President

  9. #9
    Fortis Fortuna Adiuvat Omega Man's Avatar
    Join Date
    Jan 2010
    In the old days we used to fill the handlebars with lead bird-shot to help dampen handlebar buzz.
    "You can do good or you can do well. Sooner or later they make you choose." MI5
    Mod Squad
    2009 F800GS 1994 TW200

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