Question about 2005 Suzuki Boulevard C90

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Backfiring My 2005 Suzuki C90 boulevard backfires when down shifting

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  • wbolan2 Jan 02, 2009

    Just bought bike last fall, It has aound 12,000Kil it.. the only add on is a set of Cobra longshots !! Thanks for your help in advance Bill

  • Anonymous Feb 06, 2009

    2005 c90 with the same problem along with loss of power and poor gas mileage

  • Anonymous Feb 15, 2009

    I have a C-90T and had cobra longshots put on and it backfired like crazey, than I did some research and baught a" Bully" computer, specifacally programed for the C-90T and with a little twixing I stopped the backfiring, This computer is programmable and I had to further adj the computer , but it did fix the problem , so it definatly was an air fuel thing going on after the new pipes were installed.

  • Anonymous May 13, 2009

    Mine's an '06 with Cobra pipes - Power Commander installed. Backfires and gargles when downshifting or letting off the throttle. One suggestion I heard was to block the emissions control off.

  • paul erickson
    paul erickson May 11, 2010

    any mods done to this bike like pipes or other.

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When you replaced the exaust you should of had the jetting changed they have to be rejetted.
there is your problem

Posted on Jan 02, 2009

  • ben CH
    ben CH Oct 12, 2012

    efi genius

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Backfiring means you have an air leak or a lean mixture. Look for leaks at the header pipes or perhaps a crack in the exhaust.
Cold air getting into the exhaust is usually what causes the backfire noise.
You may have a lean engine running situation but the bike would have other issues besides the backfire.
Let me know if you are having any other issues or if it just the backfire.
Regards,
RSelvy

Posted on Jan 02, 2009

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The popping sound is indicative of the Suzuki C90 line. To minimize the popping noises, perform the pair valve removal and switch to NGK Iridium spark plugs. Also, look into a Stage III kit for your bike and find a fuel map that best suits your needs. It won't eliminate all of the popping, but it will get rid of about 95% of it.

Posted on Jun 23, 2012

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I have a C90T with all the same specs and even with the Bully you can get some backfiring. The only way I was almost totally able to stop the back firing is to complete the pair value modification (block or remove). Google 'Mocc's place'. He has detailed instructions on how to complete the mod. Very easy and makes all the difference in the world (even if you do not have the bully or pipe mods).
Regards,
GGRinds@clubsuzuki,org

Posted on Apr 12, 2011

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