Popping on decel
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Stellar HDF Member
Joined: Feb 2008
Posts: 2,156
Likes: 1
From: Pittsburgh, PA
Popping on decel
I have been reading alot of post on different forums about decel popping and it seems like half say it's caused be a lean condidtion and half say a rich condition, a few say exhaust leak. Lean makes no sense to me at all. Anyone want to chime in on this subject? I am trying to get to the bottom of it concerning a bike with stock a/c, drag pipes, carbs. Thanks 
The lean issue didn't make sense to me especially when I was told it was cause by fuel making it to the header pipes and exploding... I just know when I richen'ed up my rear heard the decel popping went away. Keeping mind that was my situation with a 2000 Honda Ace though.
I have not had to deal with an exhaust leak, so I cannot speak on that, but if there was I think that could cause a lean situation though...
I have not had to deal with an exhaust leak, so I cannot speak on that, but if there was I think that could cause a lean situation though...
Last edited by bcane98; Sep 14, 2009 at 02:19 PM.
Elite HDF Member
Joined: Feb 2008
Posts: 3,817
Likes: 2
From: Novi MI
Decel popping is not a backfire. It's caused by a minute amount of unburnt fuel burning in the exhaust when it hits the hot pipe. That's why you don't hear it when the engine is cold. My RK doesn't have it and my Heritage does after having the stage 1 done. I could have had it tuned out but I decided I like it and kept it.
Last edited by barjbar; Sep 14, 2009 at 02:14 PM.
Cruiser
Joined: Jan 2009
Posts: 126
Likes: 0
From: Ont Canada
From what I gather {kinda in the same boat you are} it's a rich fuel mixture and a timing issue. My last bike was fixed with the timing. It was carberated. By the sounds of the efi bikes they get the fix with a new map. Sorry
Stellar HDF Member
Joined: Mar 2007
Posts: 2,034
Likes: 45
From: Michigan
I have a pcIII usb and the bike runs great but it has decel popping and I just ignore it 
... Every once in a while when I go to start it it backfires thru the intake too and I ignore that also.. Screw it just ride ..........
... Every once in a while when I go to start it it backfires thru the intake too and I ignore that also.. Screw it just ride ..........
Cruiser
Joined: Mar 2009
Posts: 158
Likes: 0
From: Austin, TX
Interesting. I run an '09 with a PCV and Rinehart slip-ons. Not sure why it works, but I added fuel to the 0% column in my map and it fixed the problem.
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Tourer
Joined: Sep 2007
Posts: 298
Likes: 0
From: Alden, NY
A few months ago, when I was looking for another fuel management device, I took an online "tuning" quiz at one of the product sites. One of the questions was what caused decel popping. I had always thought it was unburned fuel from a too rich condition. I failed. The answer was too lean.
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Extreme HDF Member
Joined: Oct 2008
Posts: 15,321
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From: Phoenix, Arizona
It works because the additional fuel delivered by the PCIII enriches the otherwise too lean charge enabling it to combust in the cylinder instead of collecting in the exhaust to create a pop.
