D&D FatCat Question

Discussion in 'Engine, Fuel and Exhaust' started by flhx2008, May 11, 2016.

  1. FXDL4ME

    FXDL4ME Member

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    I have a new Low Rider with SE Heavy Breather and FatCat exhaust, with dealer download. My bike pops and backfires through the exhaust when I'm accelerating and upshifting. Usually between 1 and 2, 2 and 3,. It doesn't backfire on decel at all, just burbles a little. But when mildly accelerating, I pull in the clutch and 2 or 3 out of 10 times I get a backfire. My question is....is this normal for a 2 into 1 pipe? A FatCat pipe? Bike seems to run fine other than this, and the plugs look good(light tan). Am I too lean, too rich, normal for this pipe?
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    The dealer download is EPA compliant TOO lean, you need more fuel
     
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  3. Jeff Klarich

    Jeff Klarich Well-Known Member Contributor

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    Dealer downloads are a waste of time and money. You may want to invest in a fuel management system, many on the market. Adding more air and an exhaust change will lean it out more than it already is. Take a look in the self help section and see what others are running and that will help you make an educated decision.
     
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  4. dolt

    dolt Senior Member Contributor

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    No, backfiring is not normal for any exhaust. Your motor needs a fuel management system and a proper tune as has been pointed out. Several systems available. The V&H FP3 is fairly new and getting good reports from users on friendliness and customer support.
     
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  5. dbmg

    dbmg Experienced Member

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    Jack Klarich likes this.