D&D FatCat Question

[FXDL4ME]

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?

 

[Jack Klarich]

The dealer download is EPA compliant TOO lean, you need more fuel

 

[Jeff Klarich]

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.

 

[dolt]

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.

 

[dbmg]

Great advice from some Pro's here. Your dealer sold you a bill of goods. As stated the download from dealer is EPA compliant and raises rev limiter 500 RPM. It is not design to en richen mixture to prevent back fire.
A good read:
http://www.hdtimeline.com/threads/engine-tuners-you-would-or-wouldnt-recommend.6945/