Decell Exhaust Pop
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Stage IV
Joined: Dec 2023
Posts: 4
Likes: 0
From: Brownsburg, IN
Decell Exhaust Pop
Hello All,
I have an 06 RoadKing which I purchased from original owner. He put aftermarket slip ons and claims he had the bike tuned by Harley afterwards. Shortly after purchasing it I notice a deceleration pop from the exhaust. This bike only had 21,000 miles on it, so he didnt ride it much in the 16 years he owned it.
I just had the fuel injectors replaced with Harley recommended injectors in 06 bulletin and Harley installed Stage One update afterwords. The deceleration pop is a little more profound.
I had a ex-Harley mechanic tell me there is a crack in my rear header pipe near the Y. Yes, this has original header pipes except the slip ons. However, after an in depth look and removing all hear shields, I cannot see a crack.
So, if you were in my spot, would you replace the header pipes in hopes that cures the deceleration pop, or have Harley do another tune? Also, after the header pipes are replaced, do I need to have the bike tuned again???
thank you to all in advance.
Dan
I have an 06 RoadKing which I purchased from original owner. He put aftermarket slip ons and claims he had the bike tuned by Harley afterwards. Shortly after purchasing it I notice a deceleration pop from the exhaust. This bike only had 21,000 miles on it, so he didnt ride it much in the 16 years he owned it.
I just had the fuel injectors replaced with Harley recommended injectors in 06 bulletin and Harley installed Stage One update afterwords. The deceleration pop is a little more profound.
I had a ex-Harley mechanic tell me there is a crack in my rear header pipe near the Y. Yes, this has original header pipes except the slip ons. However, after an in depth look and removing all hear shields, I cannot see a crack.
So, if you were in my spot, would you replace the header pipes in hopes that cures the deceleration pop, or have Harley do another tune? Also, after the header pipes are replaced, do I need to have the bike tuned again???
thank you to all in advance.
Dan
Grand HDF Member
Joined: Mar 2013
Posts: 4,922
Likes: 589
From: Running with the gators
Either way I’d replace the exhaust. Mostly due to age. Then I get a tune from either Fuel Moto or a independent local shop.
Both will add one grand or better to your expense.
Side note. If you feel that you will melt next time you walk into a Harley dealer and mortgage a new ride. I’d just ride it like it is lol
Both will add one grand or better to your expense.
Side note. If you feel that you will melt next time you walk into a Harley dealer and mortgage a new ride. I’d just ride it like it is lol
Seasoned HDF Member
Joined: Apr 2014
Posts: 5,468
Likes: 2,518
From: Lititz Pa
First check your headers with some spray soap if it bubbles. then you got a leak. First put a wench on it a make tighter and try the soap stuff again. As far as decal popping that happens maybe to much fuel. Maybe a tune.
Club Member
Joined: Sep 2010
Posts: 15,428
Likes: 7,122
From: Beyond Fucital
Unless it's on the exhaust side don't use soapy water, you won't see bubbles, it'll get sucked into the heads on the down stroke.
Use WD40 and listen for a change in the sound of the engine.
Use WD40 and listen for a change in the sound of the engine.
Last edited by RANGER73; Mar 7, 2024 at 11:45 AM.
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Road Master
Joined: Jun 2013
Posts: 1,058
Likes: 953
From: Sarasota Florida
The dealer is the absolute last place I would go. High priced and low skilled, using Harley tuners which are limited by the EPA. I would check around and find a good Indy who knows what he's doing to tune your bike.
You will be a lot better off
You will be a lot better off
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Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
Likes: 11,217
From: San Diego, CA
Decel pop can be due to exhaust/intake leaks....
If no leaks are found, then it can be addressed in the tune.
Did the the mechanic friend actually inspect the pipe and find a leak, or was he was just guessing based on experience. That "Y" pipe is notorious for cracking.... that design was questionable as it seems there was a lot of stress at those joints in the "Y"..
Look closely as they can be hard to detect... look specifically at where pipe sections join/meet.......
Good luck and let us knoe what you find....
If no leaks are found, then it can be addressed in the tune.
Did the the mechanic friend actually inspect the pipe and find a leak, or was he was just guessing based on experience. That "Y" pipe is notorious for cracking.... that design was questionable as it seems there was a lot of stress at those joints in the "Y"..
Look closely as they can be hard to detect... look specifically at where pipe sections join/meet.......
Good luck and let us knoe what you find....
