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backfires on deceleration

Softail Models

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Old Aug 22nd, 2008, 02:00 PM     #1
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backfires on deceleration

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 by royb1953; Aug 22nd, 2008 at 02:02 PM. Reason: not enough info
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Old Aug 22nd, 2008, 02:07 PM     #2
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Re: backfires on deceleration

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.
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Old Aug 22nd, 2008, 02:09 PM     #3
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Re: backfires on deceleration

It would contribute to a lean condition without the filter.
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Old Aug 22nd, 2008, 02:13 PM     #4
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Re: backfires on deceleration

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?
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Old Aug 22nd, 2008, 02:13 PM     #5
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Re: backfires on deceleration

That or balancing, even a bad or worn tire too.
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Old Sep 7th, 2008, 08:12 PM     #6
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Re: backfires on deceleration

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?
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Old Sep 7th, 2008, 08:43 PM     #7
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Re: backfires on deceleration

Quote: Originally Posted by weasel096 View Post
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?
Put on some gloves and cover the exhaust outlets and listen for a hissing from the pipes and around the cylinders.
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Old Sep 8th, 2008, 09:01 PM     #8
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Re: backfires on deceleration

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????
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Old Sep 8th, 2008, 09:04 PM     #9
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Re: backfires on deceleration

Quote: Originally Posted by weasel096 View Post
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????
did the backfiring just start recently or has it always had the problem?
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Old Sep 8th, 2008, 09:34 PM     #10
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Re: backfires on deceleration

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