rpm-matching squeak under front engine cover

Discussion in 'Old's Cool' started by datchew, Mar 26, 2009.

  1. datchew

    datchew Don't buy from Brad

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    1989 r100gs

    Just rode a VERY hard 720-ish miles to Florida and back to aid with a very sick kid. Upon return, something under the front engine cover is squeaking in sync with the motor RPM.

    I'm thinking brushes or the cam/lifter interface of the points (my bike is converted).

    Can't dig in till this weekend and time's running short for the spring fling.
    Question: has anyone had similar experience?
    I'm hoping for a lucky "oh that's easy just do this" fix.
    #1
  2. Cigars&Scotch

    Cigars&Scotch My eyes are up here

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    I would pull the cover (with the battery disconnected), reconnect it and start her up to see if you can pinpoint the squeak. It should be pretty apparent to where its coming from. You really only have the rotor and brushes, timing chain, bean can and front seal.

    Also double check your oil level. I had a cylinder head that was making more noise than usual and it turned out to be low on oil do to a 750 mile run.
    #2
  3. Stagehand

    Stagehand Imperfectionist

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    its the battery.
    #3
  4. datchew

    datchew Don't buy from Brad

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    stop that you.


    Will do Mike. Oil level is good. I check it religiously and it usually stays just right unless I fun 80+ mph on the freeway for a few hours.
    #4
  5. Stagehand

    Stagehand Imperfectionist

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    :lol3 I am so sorry i have been dying to use that since this morning, I dont know why.

    I wish I could help with random noises under the hood, but... holy crap man :lol3 where to begin? If I know GS's it will not be there when you go to start it up next time. :norton
    #5
  6. RandyB

    RandyB .

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    Earplugs.
    #6
  7. bmwrench

    bmwrench Long timer

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    My guess is that the diode board mounts have broken and the board is resting against the cover.
    #7
  8. bgoodsoil

    bgoodsoil Dare to be Stupid

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    that's what you get for going back to points, luddite! Why don't you just hire two cavemen to sit over the spark plug holes and bang rocks together!

    Hate to say it man, but you may have a bearing going. I can't picture brushes squeeking. could be one of the dragons in the bean can has a cold though. Try touching things and feeling for vibration if the sound doesn't give it away. I found a bad pulley on my mom's trailblazer that way. She was CERTAIN it was the transmission(all problems involve the 'transmission' with her, I don't think she even knows what it is).

    you ask a simple question and get 5 smart-ass comments. man I love this place!
    #8
  9. datchew

    datchew Don't buy from Brad

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    hmmm. More stuff to check. Well, i'll dive in this weekend.

    If it's a bearing going, that may be the end of my relationship with this bike.
    And I won't just sell it, I'll take it apart piece by piece and send it to the 4 corners of the earth cursing every last piece as it departs my presence forever.

    So, let's hope it's something simple. I'm a bit edgy on the temper lately.


    ps. Solid mounts on the diode board. Good thought though!
    pps. I heard it despite earplugs. it's almost perfectly cricket pitch.

    Sounds EXACTLY like the bushings dying on the blower fan from an e30.
    #9
  10. WooPig

    WooPig Gravel Traveler

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    Now don't go all Hulk again. :D
    Mine has the roo bars and all the fiberglass crap. Squeaks and chirps constantly. I would never hear this bearing failure thing. So if you part it out... dibs on the headlight pod!
    #10
  11. RandyB

    RandyB .

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    I need an oil cooler and some spokes.

    We need a vulture avatar for times like this.
    #11
  12. bpeckm

    bpeckm Grin!

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    :D



    No problem, mon!
    long ago we all decided











    :D
    #12
  13. bmwblake

    bmwblake upside down parker

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    i'm still waiting for you to buy a honda.


    #13
  14. bgoodsoil

    bgoodsoil Dare to be Stupid

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    wait, chirping? you said squeeking! now that's a whole different matter.

    I should've said this earlier but best wishes to the kid. I hope he gets better.
    #14
  15. Infracaninophile

    Infracaninophile Finding My Way..

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    I'll trade you all of my old hulk memorabilia for your GS. How much gas is in the tank? That will alter my valuation of your bike. :deal

    I'm sure it's something simple (but incredibly expensive).

    T.
    #15
  16. StephenB

    StephenB G(/)S ... what else!

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    The hamster spinning the wheel again ...
    #16
  17. datchew

    datchew Don't buy from Brad

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    I know i know. I'm still waiting on a 72-73 CB350 or 400-500 whatever to come along for a really killer deal.

    Always loving the moral support here. :huh


    Kid is much better. We feared pneumonia and it was close. He's been on a steroid and now some beefy antibiotics and O2 levels are good now. :thumb

    Still kinda wimpy, but since I'm on vacation i'm taking him to the spartanburg Zentrum to look at some old bikes (and get pics so i know what goes where on my /2 project :deal)
    #17
  18. bgoodsoil

    bgoodsoil Dare to be Stupid

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    Glad to hear about the kid!

    I'm by no means an expert on the vintage hondas but I've talked to a few and read gobs about them on the interwebs. Here's some general info I've picked up.

    I've been told the 450 twins don't handle highways much better than the 350s, they weigh more and they don't handle as well.
    Of course, if you get a chance at a mystical black bomber TAKE IT.

    The 360 twin is pretty much worse than the 350 in every way.

    The 350 four cylinders are more complicated, don't make any more power and don't handle as well. They are supposed to run very smoothly though-inline 4s are smooth engines and this small of displacement makes it even better. I met a local motorcycle mechanic that uses a 350f as his main bike--he said he just really likes the sound.

    Out of that era of Hondas I think I'd take either the 350 twin, cb500/550, or a cb750. If you're going to have to deal with the added complexity of 4 cylinders you might as well get the most out of it.

    I've heard nothing but good things about the 500--plenty of power, fairly smooth, not as heavy as the 750. Also, the 500 has vertical cylinders whereas the 750 is raked forward. The vertical looks more vintage to me so I like it better.

    The line in the sand for me on the models is the gas tank. When the model goes to anything other than a flat bottom gas tank or it gets those molded side panels it turns into ugly 80s styling and I lose all interest.
    #18
  19. bmwblake

    bmwblake upside down parker

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    i bet this is related to your points. you thought you fixed things but now you have to listen to squeaky points.


    btw, if you get a honda it's supposed to be a newer one with less "character" and "soul" than an airhead.
    #19
  20. Solo Lobo

    Solo Lobo airhead or nothing

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    ouch, that's brutal :lol3
    #20