Question about Harley Davidson FLSTC - FLSTCI Heritage Classic Motorcycles

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Backfiring and popping on deceleration on a 2005 FLSTC, after installation of Vance & Hines longshot HS exhaust, & Big ****** air kit. The bike has sequential port f/i and was remapped with a generic program. What to do?

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Aftermarket pipes tend to lower back pressure, this will cause the fuel/air mix to lean out and result in the "popping" you hear---Backfiring, is extremely rare these days with electronic ignitions and the high reliability of engines. Real backfiring means the engine is not properly timed and the fuel/air mix is getting a spark and ignition at the wrong time (when the intake valve is open). Real backfiring is actually the bike "spitting up" in a sense, backwards through the carburetor or intake.You can check for exhaust leaks up around the cylinder heads by putting on some gloves and covering the exhaust tips momentarily. I have seen exhaust leaks that will make the popping worse by allowing air to be sucked in during deceleration...Hope this helps.

Posted on Jul 03, 2011

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How to put on Vance &hines longshots on a 2002


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Backfire on deacceleration


Get the fueling set up on a rolling road. Honda set the fuelling to suit the Emissions and the Exhaust they fitted.An after market exhaust will usually have less backpressure and need a set up. When you say backfire, do you mean a great big bang or just a little popping sound from the exhaust? If it is the latter, it isn't a massive problem but a set up will cure it. A Big Bang could be a cause for concern as it means the ignition is taking place when the Exhaust valve is open and firing in the exhaust itself. This will give a drop in performance and may cause the engine and exhaust to fail.

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Let me know via baxr09@yahoo.com.au if you get a solution, Mine is doing similar but mine is holding back at half throttle to, Wont rev high at all just chokes under load

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