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Thread: Moaning sound

  1. #1
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    Moaning sound

    I am getting a moaning sound when the bike has been run a bit. Only when the bike is rolling. I guess I should take it on a hill and do a coast test out of gear. Unfortunately, between old ears and the helmet my hearing is pretty much non-directional.

    My best guess, at the moment, is the speedo drive gear. Can anyone think of other posibilities?
    2013- '80 CX500 Deluxe with Standard seat and tank. (Rat Runabout)
    1984-1989 '81 CX500C, mod'ed to sport tourer


    Tom
    www.tomrit.com

  2. #2
    Senior Member missing linkage's Avatar
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    I'd shut off the motor while coasting too, to determine if it is a motor or wheel generated sound.
    '83 CX650E with various Goldwing hardware

  3. #3
    Senior Member Joel's Avatar
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    Double check air pressure in the tires.

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  5. #4
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    Quote Originally Posted by Joel1 View Post
    Double check air pressure in the tires.
    Good idea, I have not had a problem with that but there are now some kids in the apartment across the parking lot from me. Maybe some mischief involved.
    2013- '80 CX500 Deluxe with Standard seat and tank. (Rat Runabout)
    1984-1989 '81 CX500C, mod'ed to sport tourer


    Tom
    www.tomrit.com

  6. #5
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    The key word(s) here is "has been run a bit" which implies a temperature warm up noise. Its also described as a "moan"- would you also describe this as a "growl"?

    I hate taking bikes apart- see if you can find a wooden dowel about 18" long and use it as a stethoscope and put one end next to your ear and the other on different parts of the bike- you may be able to isolate the sound that way. Do the "engine off freewheel down the hill" test first. Then I think I'd start at the lower part of the engine with the dowel, see if the moan is from the bearings, then I'd work my way back on the prop shaft after jacking her up to clear her rear wheel, gun the engine and see if the moan comes back. If it does it could mean engine overhaul (sux) grease the prop shaft (you wanted to do that anyway right?) or the rear wheel bearings. If it doesn't come back, that'd narrow it down to tires or front wheel bearings (and you wanted to grease and inspect the front wheel bearings like the Good Book Factory Service Manual says to do every 10,500 miles anyway right?).

    I'd suggest you do all these tests, then go have a cup of coffee and let your subconscious mind work on it. I had a professor once who said "You'll fix more things over the coffeepot than you will the bench" and he's right.

    Hope I gave you some ideas anyway.
    1981 CX500C

  7. #6
    Senior Member JUNK_MONKEY's Avatar
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    Well I dont know about the coffee pot but I have thought of a few solutions while on the toiletottytrain5:
    BUILD IT, RIDE IT,FIX IT, REFUEL, AND REPEAT (tattooed on my left arm)

    82 gl500

    80 cx500c

  8. #7
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    look over your shoulder, soulds like my ex-wife is riding with you

    love

    g
    Condo and Trailltrader like this.

  9. #8
    Senior Member tonyjuliano's Avatar
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    Bet its either the speedo or tach cable.
    Current Stable:
    1979 Honda CX500D - The Daily Driver
    2007 Buell XB12STT - Hooligan Bike
    2007 Honda VFR 25th Anniversary Edition - Long Range Comfort
    1996 Suzuki GSF600S Bandit - Kind of Fun!
    1968 Honda CB350 - "Old Fogey" Race Bike


    My 1979 CX500D Restoration :icon_thumbright:

  10. #9
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    or a brake check for heat in the front or rear brake after a ride
    GET AN OIL FILTER ADAPTER

    Order The Quick Build Exhaust Pipes


    GET A QUICKSET VALVE TOOL


    Way to many bikes to maintain this list LOL !!

    email me at murray at murrayscarbs.com

  11. #10
    Junior Member misscrabstick's Avatar
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    How about the rear axle drive making a noise? checked the oil level lately? can you run the bike in gear on the mainstand and listen?

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