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New exhaust/ knocking noise 06 750

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  • New exhaust/ knocking noise 06 750

    2006 750:

    Removed stock exhaust and successfully installed two bros m-2 VALE carbon fiber slip-on. Sounds great, looks even better. Checked close- no leaks at the stock header or the s-bend/ muffler connection.

    Ever since the install: idle speed dropped from 1250 to about 1000rpm and during long periods of idling (red lights in construction zones, lines of traffic, etc) a knocking sound can be heard from directly underneath the tank.

    I upped the idle speed from 1250rpm to 1400rpm and the sound stopped, but persists during warm-up period, and anytime idle speed falls below ~1250rpm.

    Is this knocking noise a major cause for concern? Are the Pistons going to run dry, explode and cost me thousands? Can I just ride with an idle speed of 1400rpm and forget about it? Was just installing this slip-on myself a bad idea?

    These are the questions that plague me when I should be sleeping. Please respond.

    much respect, much love,
    AllBlack2Bros

  • #2
    When was the last time the valve clearances were adjusted? It's likely valve train noise.

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    • #3
      Damn couldn't say but I'll bring that up on our next trip to the shop. Thanks!

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      • #4
        If you want it done properly at a fraction of the price, you'll do it yourself.

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