Sound When Rolling off the Throttle

Discussion in 'Motorbike Technical Discussion' started by JJP, Jun 7, 2004.

  1. JJP

    JJP Guest

    Maybe someone hear can help me understand whats going on with my bike.
    I have a 98 YZF 600, stock with the exception of a D&D slip-on. When
    I roll of the throttle at mid/low RPM (3000 - 9000)I hear what almost
    sounds like small backfires. A glug-glug kind of sound if you know
    what I mean. My uncle (a mechanic) has commented on the rare occasion
    that I've seen him with the bike that it sounds like its running rich.
    Anyone know the cause or if its something I should be concerned
    about. Thanks in advance for constructive comments.

    JJP, Jun 7, 2004
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  2. JJP

    JJP Guest

    Thanks for the advice, checked the plugs - nothing looked out of sorts
    to me either rich or lean. Any other ideas?

    JJP, Jun 11, 2004
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  3. JJP

    opietaylor69 Guest

    Re: Sound When Rolling off the Throttle

    Group: Date: Fri, Jun 11, 2004, 11:52am (EDT-3)
    From: (JJP)
    Some bikes have a "pair" valve, to meet emissions requirements. (smog
    pump) Fresh air is injected into the exhaust ports, and this causes an
    afterburn, or "popping" upon decelleration. If your bike doesn't have
    one, then you are simply lean in the low end circuit.
    opietaylor69, Jun 12, 2004
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