backfires on deceleration

Discussion in 'Softail Models' started by royb1953, Aug 22, 2008.

  1. royb1953

    royb1953 Member

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    about 2 weeks ago, I noticed my fatboy backfiring when changing gears or when throttling down to slow. any ideas on why? I have 40 K miles on her, but have changed the spark plugs about 6 months ago.
     
    Last edited: Aug 22, 2008
  2. royb1953

    royb1953 Member

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    would taking the air filter out of the cleaner lean it down too much and cause this? the filter was taken out due to being very dirty, another filter ordered but hasnt come in yet.
     
  3. glider

    glider Veteran Member

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    It would contribute to a lean condition without the filter.
     
  4. royb1953

    royb1953 Member

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    ok, thanks!!! now another question for you... when I slow down, if I take my hands off the handlebars, I get quite a shimmy unless I put my hands back on the bars. too much play in the head bearings?
     
  5. glider

    glider Veteran Member

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    That or balancing, even a bad or worn tire too.
     
  6. weasel096

    weasel096 Member

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    Sorry to hijack this discussion but I am having the same problem. 2005 Softail. Only mod is a K&N air filter. How do you check for exhaust leaks?
     
  7. glider

    glider Veteran Member

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    Put on some gloves and cover the exhaust outlets and listen for a hissing from the pipes and around the cylinders.
     
  8. weasel096

    weasel096 Member

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    Did the glove thing and there seems to be no exhaust leak. I dont wanna keep it covered to long. I also sprayed wd40 around the carb and intake and there was no noticable increase in the rpm. Any other ideas????
     
  9. wildspirit97

    wildspirit97 Senior Member

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    did the backfiring just start recently or has it always had the problem?
     
  10. weasel096

    weasel096 Member

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    I just got it a week ago and it has done it since I got it.