Decel popping
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Outstanding HDF Member
Joined: Oct 2011
Posts: 3,492
Likes: 19
From: Illinois
Decel popping
I have been watching and reading about this decel popping thing for over a year now. I have never really hit it hard since most of my work has been done. I have given it a gut check a few times into 3rd and then I let it drop off. I can NOT get my bike to decel pop. I was crushing it yesterday in 1st gear then just totally back off the gas and it will not pop, I tried to make it pop and couldn't.
So, what is or what causes decel pop? I'm not complaining but why wont it pop? I don't want it to pop and I'm glad it doesn't but what is the difference between my bike and the bike next to me that pops? I have a theory or two but that's all it is.
So, what is or what causes decel pop? I'm not complaining but why wont it pop? I don't want it to pop and I'm glad it doesn't but what is the difference between my bike and the bike next to me that pops? I have a theory or two but that's all it is.
Elite HDF Member
Joined: Jul 2008
Posts: 4,762
Likes: 12
From: north jersey
What he said !! I think unburnt fuel which somehow makes it to the exhaust causes that pop. I've had it a time or two on my rocker before I replaced my exhaust gaskets. Always scares the crap out of me lolol.
Road Master
Joined: Nov 2013
Posts: 852
Likes: 54
From: Dallas tx
What they said. It's mostly caused by raw fuel in the exhaust coupled with a timing issue. I did read a thread where someone said installing new plugs helped reduce the problem. Didnt make sense to me. But, my bike started doing it and got progressively worse. I remembered that thread and thought what the heck. Plugs are cheap. I replaced the plugs and low and behold it cut about 3/4 of the problem out. It still doesn't make sense though as worn plugs shouldn't create latent fire.
Now, if someone would give me a good answer on the thread I posted yesterday..
Now, if someone would give me a good answer on the thread I posted yesterday..
Last edited by Pitbull_Dallas; Apr 5, 2015 at 09:41 AM.
Thread Starter
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Outstanding HDF Member
Joined: Oct 2011
Posts: 3,492
Likes: 19
From: Illinois
Yea, I guess we are always learning, at least I would hope so. I am way over the top when it comes to maintenance on my bike. I put new plugs in at the start of every riding season and I have yet to go over 2K a season. This year they going to pile up though, going out west this august.
My theory is what I have preached for years, head work with cams to match, auto tuner and putting it on the Dyno. No raw gas is getting past my heads.
I could be wrong but that's what I'm thinking.
My theory is what I have preached for years, head work with cams to match, auto tuner and putting it on the Dyno. No raw gas is getting past my heads.
I could be wrong but that's what I'm thinking.
Extreme HDF Member
Joined: Dec 2010
Posts: 14,778
Likes: 69
From: Badlands of ND
You do not see (hear) it much after the closed loop EFI systems. If all is working well, it just should not happen. My old 2002 Night Train could rumble and pop with the best of them. The old carbed bikes made some great sounds that EFI has tuned out for the most part.
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Stellar HDF Member
Joined: Jun 2014
Posts: 2,062
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From: Midlands of SC
My bike rumbles some at low rpms only. Anything 2600 rpm or higher and you let off, you get the jake brake sound(pretty cool). Dealer has messed with the SE pro tuner several times and its much better. I dont think it will be right until it gets tuned by a dyno tune person that's good. I am going to get some cams and I will wait until that's done. Problem is finding a good tuner here in mid-SC.
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Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
I have been watching and reading about this decel popping thing for over a year now. I have never really hit it hard since most of my work has been done. I have given it a gut check a few times into 3rd and then I let it drop off. I can NOT get my bike to decel pop. I was crushing it yesterday in 1st gear then just totally back off the gas and it will not pop, I tried to make it pop and couldn't.
It's usually more of a problem on short pipes, and you have super-long ones.
When your bike was tuned, it may have been set up excessively rich or lean on decel to eliminate any tendency to pop. If the fuel/air mixture is set up too lean or rich to ignite easily, it won't pop.
Supporter
Joined: Jun 2012
Posts: 2,912
Likes: 73
From: Pittsburgh, PA
I once trusted a dealer to do the right thing when they installed my pipes and a/c for free, and let them install their downloaded "canned map" to complete the Stage 1.
It was awful - the heat was off the charts and the decel pop was unbearable, it NEVER stopped.
It was so loud and nasty it made me want to get off at times.
Then the V&H FuelPak3 came out.
I bought one and it hasn't popped since, and I can no longer intentionally do it either.
So for me, the tune made all the difference.
It was awful - the heat was off the charts and the decel pop was unbearable, it NEVER stopped.
It was so loud and nasty it made me want to get off at times.
Then the V&H FuelPak3 came out.
I bought one and it hasn't popped since, and I can no longer intentionally do it either.
So for me, the tune made all the difference.