Ominous chirping sound from my S40

Discussion in 'Motorbike Technical Discussion' started by Sean_Q_, Aug 24, 2008.

  1. Sean_Q_

    Sean_Q_ Guest

    Lately my S40 (aka LS650 belt-drive Savage) has developed a chirping
    sound which seems to be coming from the rear wheel. It starts about
    40 kph (25 mph) and is worst (ie, loudest) at about about 55 kph.
    Above 60 kph it seems to diminish.

    The noise is somewhere between a chirp and a scrape and it sounds
    awful unnatural, as if something is wearing itself to pieces.
    It happens only when there's power to the rear wheel. If I pull in
    the clutch and coast the sound stops.

    I've examined the drive belt and the rear sprocket teeth and found
    nothing unusual.

    Any ideas what's going on, or what I can do to find out?

    TIA, Sean_Q_
    '99 FLHTCUI / '06 S40 / '81 CB750 AMEN chopper / various projects
    Sean_Q_, Aug 24, 2008
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  2. Look at the sides of the belt to see if one side is shinier than the
    other side.

    If so, the nut holding the front sprocket may have loosened up.

    There is a soft metal toothed washer that is supposed to hold the nut
    and keep it from loosening up. But the washer is made of soft steel
    that will fret and wear the teeth out of the center, allowing the nut
    to loosen up.

    Also, you might want to check the rear brake drum to see if there is a
    lot of brake dust build up, and lubricate the operating cam while
    you're inspecting the rear shoes.
    ÃÄÈËÎÐÓÖØÙ, Aug 24, 2008
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