Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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Pop in air clearer some time on accelerate - FLSTC Heritage Softail Classic Harley Davidson Motorcycles

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  • wd4ity
    wd4ity Aug 31, 2010

    This is because the fuel air mixture is set so lean from the factory to make the EPA happy. Is your bike carb equipped or fuel injected?

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The motorcycle is running too lean, which causes the pop back in the carb.

Posted on Sep 02, 2010

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Hi, Gary if your carburetor or exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
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BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Loud popping on deceleration bad spark plugs Bad gas motorcycles
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http://www.partsfish.com/page/oem-parts-for-honda
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1 Answer

I have a 2007 CRF450R that pops just off idle while accelerating. Mid to full throttle no problem.Pops while decelerating ,too.Also off idle pop goes away when engine is hot but decelerating pop still...


Hi, Kpapalko180 if your carburetor/exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
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BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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