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  1. #1
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    Default CLUNK CLUNK CLUNK Now what!?

    Over the last about 48-72 driving hours I noticed a clunking sound when decelerating. It is in time with the front sprocket. Now it is radical noise when slowing down and when coming to a stop it's a fast clunk then slows. I was thinking oh great after all the money I sunk in this pit the transmission is gonna blow up. In the driveway, in neutral (no engine running) I can roll it fwd and rev and there is a loud "clunk clunk" as it moves. This leads me to think it may not be the transmission but something else.

    I did have the front pulley off last year to replace the GBPS sensor, it was fine with no red dust or cracked/broken grooves. Put it back together with a fresh bolt from cheapcycleparts.com, torqued to the higher spec. It shifts & accelerates smooth as butter. The clunking doesn't come to the back tire (no jerkiness) when it is slowing down.

    I am clearing out a space in the garage to jack it up and take the belt off to start with rocking the front pulley to see if there is a lot of play, then take it off. Looking at the drive system on cheapcycleparts (clutch plates out to front sprocket) I don't see what could wear down and and make a gap or something.

    It may be my imagination but I swear I hear same noise on all GS/RS on when it's moving, but it really quiet. Maybe whatever "moves" or has a gap just cracked or broke. Clutch basket maybe?

    I imagine some gear head has seen (rather heard!) this before and might know what it is I am praying!!

    Thanks!
    Steve

  2. #2
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    Default

    Yeah. That same thing just happened to me yesterday. I just put up a post before I read your thread.

  3. #3
    Very Active Member IGETAROUND's Avatar
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    Check ALL the teeth on your drive belt!!!!!
    All the great movements in the world began with a cup of coffee!


    2014 RS SM 5


    My mods: trailer hitch, outlets for GPS and I-touch to listen to music with. Mad Stad 22 in touring windshield, clear protective wrap on side panels and behind steering head, neoprene grip cushions, Bead rider seat cushion, Smooth Spyder backrest, Day Long seat, Time out trailer, Garmin 660.

  4. #4
    Active Member Richardv's Avatar
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    Montreal north shore, QC
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    Quote Originally Posted by IGETAROUND View Post
    Check ALL the teeth on your drive belt!!!!!
    And check the teeths of the front and rear sprocket for a rock wedge in there.



    Richard

    * 2012 RS SE5 (hers)
    * 2013 ST SM5 (mine)

    Daughter RSS SE5 2014
    Son in law RSS SM5 2013

    P.S. 3 Kumho AST 225/50R15 and 1 Toyo Proxies 4 225/50R15 rear tires
    2 sets of Kumho 175/55R15 front tires
    1 set of Hankook V4
    1 set of Canadian Tire General tire Evertrek RTX in 14" for the 2012 ...

  5. #5
    Active Member
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    Default

    Turns out it was the front pulley. Inspected it 6 months prior it was fine. After taking out bolt it wobbled on the shaft badly. New one installed, runs great now.

  6. #6
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    Default

    Glad it's resolved. Thanks for posting the update.

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