Love It Or Hate It - Deceleration Pop - Is It Bad?
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- Опубликовано: 7 июл 2024
- Myths & Facts About Harley Exhaust. Decel Pop- Is it Bad for your Harley?
Is it Indicative of a Bad Tune? Find out Why Your Harley Has Decel Pop.
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these guys are awesome there are no other channels that even compare to what ive learned watching them.
Glad that you find value in our videos. Thank you for your support and for commenting! MB
DK Customs is phenomenal. Love the content and knowledge you are imparting on us.
Thank you for the kind words, and great to hear you are finding the videos useful. 👍
Thank you for sharing-
With my latest 3.0 TTS tune, against advise, I made a ‘test tune’ to experiment and turned off my decel enleanment and limited my accel enrichment. (After full and accurate MAP/RPM mapping)
Now it’s a very mellow pop with tempo- much more acoustically pleasing- will monitor for negative effects
I hope that you get all the results you are looking for! Thank you for commenting! MB
Glad to hear deceleration pop does not harm bike. My CVO Breakout with V&H Big Radius pipes had loud decel pop; I had a Harley dealer look at it because it was pretty loud. They tuned it and it still popped so I'm not going to worry about it anymore.
Don't remember the years of the CVO Breakout, but I think they were all Twin Cams. Depending on your Dealer, you probably have an EPA compliant tune in that bike. If that is the case, then it is probably running a bit too lean for its own good. Worth checking in to. Here is a video on the subject- ruclips.net/video/7sn7CrmSDL4/видео.html
I second what DK said.. I had a tc 96 with big radius on a 2012 street bob. That exhaust made it a bit too lean. An indie mechanic pointed out to me that it was running too mean, he could tell just by looking at it when i first brought it in, the exhaust stud nuts were chalky white from the excessive heat, he tuned it on the dyno with a power commander and that bike ran amazing after, ran cooler and no pop and a bit more power
This is the best explanation I've seen about decel pop. Thankyou guys.🙏
Thanks man, appreciate the comment!
Love the decel pop, you get noticed and people tend to turn there heads and now know your there. Love the content and now a huge fan! Thanks!!
Much appreciated, and thank you for the comment. 👍
Yes, burbling and some popping on decel are a sweet sound to my ears.
Ty gentlemen! Now I love my decel pop!😊
Thanks for the comment. Good to hear, maybe there are more of us out there than I thought. 👍
Excellent explanation! I used to work for several different dealerships over the years, and I did see in one case where the bike running lean. The crazy thing was it new out of the bike (Yamaha V-Star 1100), of course it was warrantied, we jetted the carbs and the guy never had an issue there after.
Thanks!
Yeah, it does happen.
Had a horrible case of decel pop on my RS it turned out to be both loose and corroded pipe head connectors once the mechanic resurfaced the pipe ends never had an issue that bad. Recently with an intake manifold leak had the pop but not as bad, once I fixed that it is running ok that is it pops a little specially when engine braking hard. Question: What is “RF”?
@@mymm6327 Yep, intake and exhaust leaks can get that AFR (Air Fuel Ratio) in the exhaust just right for some wicked popping.
Thank you again for the info enjoy listening to you two , you always keep it simply
Cool, happy to hear you're liking the videos. Appreciate the comment.
Finally an answer and an explanation about the pop I get! Thanks
Thanks for the comment, glad you found the video useful! 👍😎👍
so useful- I learned many things. thank you.
Great to hear! Thanks for the comment. 👍
Thanks guys. Now I like my decel pop. 2009 XL1200C Sportster.
👍
Thanks guys. My Harley dealer recently upgraded my '23 Fatboy 114 with a higher flow air filter, TAB zombie exhaust and Dynojet Power Vision tuner. Yes it has a LOT of deceleration pop! Thanks for explaining what the "pop" is all about. My fat boy is back at the dealer having an S&S 475 cam and an S&S intake manifold installed now. Can't wait to hear an even bigger pop.
Awesome! Glad you are finding the videos informative.
Thanks for commenting! 😎
My 93 FLHS has decel explosions. Good video guys
Glad you like!!! Thanks
I’m glad I watch this video, I have diesel pop on my 2000 road king which is stock. I am a subscriber as well.
Thanks man. Glad you enjoyed, and appreciate you subscribing.
I have a 2014 Road King I put VH big radius on & SE breather have me plenty decel pop kept thinking I had it tuned wrong with VH auto tune glad you guys cleared that up for me. Was worried I was ruining my motor.
The probability that it is tuned too lean is slim, but not impossible. It is more likely that you are just having decel pop from open exhaust, not from being super-heated from too lean of a tune. But you can use your FP3 to check your AFR and if it is good/not too lean.
I love the pop it gives that Harley Hot Rod sound. 😎👍🇨🇦
I'm with you on that...but, we are a shrinking group. 👍
Love my propipe decel. Gotta watch it , lol🇨🇦🇨🇦
I love it too!
@@dawidos117 👍
I love it too. I have wrapped exhaust on my pipe which keeps the EGT high, that helps keep the pops coming!
I've bought 4 Harley Davidson from Boise Idaho. 0 have ever been in shop. You are always right everyone else is wrong. I run your inserts and oil filter, take lift on flht. Noticeable power increase, especially from filter. Below 1000 rpm the stock was better. Do a lot of ride like a pro parking lot maneuvering. Still will idle through the course no problems. Not tuned, runs great.
Good to hear you are enjoying the benefits of our parts, and we appreciate your business!
Always good to know folks are practicing their slow speed skills...it can be fun too!
saaa weeeeeet my FLHX literally sounds like the quintessential 'finely tuned, well oiled machine'.
This is one of those things you've always wondered about, but never really felt a need to worry about...
It jus sounds way to damn good to be a problem...
Thanks for the knowledge drop fellas!
stay up ✌
😎👍
Hey guys, y’all are awesome, finally a true explanation off Decel Pop. I have 2021 883 with the Vance and Hines Big Radius Pipes and the decel pop is amazing. It puts the biggest smile on my face. 😂
Glad you found the video useful, and glad you seem to enjoy the barking as much as I do. 👍
Thanks guys. I just put a set of 42" fishtails on my 2016 Moto Guzzi Eldorado with no baffles and it pops like a mofo. The Guzzi engine sounds great without mufflers.
😎👍
My 450 Rebel is perfectly synced & tuned. Both pipes have a light staccato decel pop & crackle. I love it.
Very cool, enjoy! 👍😎👍
Love the pop. Its just those last dinosaurs burning!..give me fuel give me fire!
👍
Thanks! I appreciate you Guys explaining your understanding and knowledge on Decel Pop.
Glad you are finding the videos useful/interesting. 👍
Best video I have found on this issue
I was concerned about the popping and the flames coming from the rear pipe on my side shots on my 08 dyna with a dynojet tuner but after watching this I feel a little better about the popping
I tried to tune out some of the pop but all I did was lose MPG and little to no less popping so I may try out the TTIs and get a professional to tune the bike for me
Do the TTI's and see how it runs. You will like the extra power. Then tune only if needed.
love your video , so true and informative ,thanks.
Thank you for watching our vids and for your comment. Glad you are finding them useful.
I just removed the quiet baffles from a bike I bought second hand with V&H pipes on it and it pops and crackles literally every single time I let off the throttle haha. It actually was doing it still with the baffles in it just wasn't as noticeable because the baffles were doing their job. I have taken off all the fibreglass on the baffles and plan to try reinstall those baffles in an attempt to find a spot with good volume and seeing if the added restriction dulls some of the pops. If not then I guess I might have to see about getting the tune looked at. It has been tuned previously so it's possible it's running lean or it was tuned to pop by the previous owner. Bike is a Yamaha Bolt 950. Great video guys!
Thanks, glad you liked the video. Here is another one on the subject you may like-
ruclips.net/video/pr6z00gL5Yg/видео.html
You could use some Thunder Torque Insert™, that will give you more power and may reduce or eliminate the pop.
See this video- ruclips.net/video/FbsPDZNi5Zw/видео.html
Link to TTI's- www.dkcustomproducts.com/thunder-torque-inserts-c57-265.htm
I just got bassani exhaust, screaming eagle air cleaner on my road glide , tuned at harley. Has decel pop I love it. As long as it's not hurting anything I like it. It's fast
Glad to hear you're enjoying your new set up. 👍
Oh, hell yeah! P-pop pop pop... '20 fxbb & I recently installed screamin eagle plugs, fatty plug wires & their hi-flow air cleaner. Would you believe it... I went to dinner & someone stole the cats right out of my pipes! Came out from the diner & the baffles were just rollin' around the parking lot... fiberglass everywhere! Crazy, man. Crazy. So, being the responsible fella I am, I installed a set of DK Customs TTI's. Man, world of difference! I followed up with install of the screamin eagle pro street tuner and WHO-EEE! She sounds like a proper Harley now... and with a bit more responsiveness. Love it! Thanks guys! Ride on.... peace!
Wow!
Glad to hear you're enjoying them. We appreciate your business.
@@DKCustomProducts HaHa! Grandson says it doesn't sound like a fart anymore... it sounds like a bunch of grenades. I'll take that as a compliment!
@@jackcompton8752 Cool! He'll always remember Grandpa and his Harley!
I always wondered if the developers pop caused damage, thanks for the explanation.
👍
Went to Bassani Road Rage on my Fat Boy Lo, all of a sudden I have decel pop. Tim from Strokers told me the same thing, so much baffling and catalytic converter, that I couldn’t hear it with the stick pipes. 👍🏻 thanks dudes
👍
Very interesting, thanks for the video...
Glad you enjoyed it! Here is a video you may find interesting - ruclips.net/video/pr6z00gL5Yg/видео.html
Had a V&H Pro pipe when I bought my 05 RK 10 years ago. Hated the pop and the sound, so made my own pipes,twice. First set were shorty ' dumps' that were loud and popped. Now have 1 3/4" long drags with homemade baffles and 'lollipops ' i made myself. No more pop and i never used a tuner. Plugs are proper color and bike runs fine, plus i like the sound. Reminds me a little of my old ironhead with straight through drag pipes.
Glad you like the video! Yeah it is crazy how easily you can change small things and get big results. Here is a video you may find interesting - ruclips.net/video/pr6z00gL5Yg/видео.html
GREAT video! TY!
Glad you liked it. Appreciate the comment.
I love y’all’s content, great stuff gentleman,
So sometimes when I hammer down on throttle, I “pop” lol!!
Not a bad thing though.
Thank you, appreciate your kind words, and glad you're digging the videos.
Yeah, I agree on the pop!
My 2014 softail slim totally stock was decel popping and I really don't like it. I put a screaming eagle heavy breather air intake, and no luck. Now I'm getting a bassoni road rage 2 into 1 and a thunder max tuner. It may not get rid of the decel pop but at least my bike will rip sh!+! 😁
All you gotta do to get rid of the pop is change the AFR in the pipes. Best way to do this is to put a TTI in your RR 2-1. See link below. You will have a bump in low and mid range power, and should have a reduction in decel pop.
www.dkcustomproducts.com/thunder-torque-inserts-c57-243.htm
Ok, I bought a 2003 Softail tuned for acceleration by a previous owner. He raced. It had open short pipes and a prominent deceleration pop. I put the stock pipes back on. I find its power, while maybe a bit less, is much more controlled. Before, it accelerated in more of a sharp on or off feel. Now, I don’t get that hard pull. I don’t hear the pop. I’m a smoother, happier rider. I don’t race. I cruise. Not everyone is served by max power.
That is true! I am glad you found what works for you! Thanks for commenting! MB
I bought the Dynojet tuner from you guys and had a lot of decel pop when I run it now. Adjusted it manually as per instructions and although it has vastly decreased, it still pops now and then..some times more than other times. Never had decel pop until I ran the tuner. Pipes are same...exhaust is same. Still run premium fuel. Originally bought the tuner to hopefully cool bike down somewhat with an enriched fuel ratio.
Installed your tank lift kit and a set of fans on side...seems to help..but still not as cool as I'd like I think. Florida 100* days can be brutal.
Yeah, the heat down south can be a bear sometimes. We have an entire playlist on how to cool down these bikes...it can take a little doing in the hot humid temps. Check out this link- ruclips.net/p/PLb3bvZgbH92_3s-2vv63QggFJ3nteFd_C
Decel pop is not bad for your bike, but you can install some TTI's in the exhaust, that will make the bike run stronger, COOLER and reduce the decel pop. And you can also use the decel enleanment feature on the Power Vision to reduce the pop, if you don't like it.
Appreciate your business, always feel free to call or write.
@@DKCustomProducts that's what I was using was that feature. Works great. It doesn't bother me really except for that once in awhile popping on decel...
THIs? Guess I am not familiar with that..what is that?
I had the same problem with my 2009 Road King. I tried to set the Dyno Jet tuner by the recommendations but still had decel pop. I finally had it tuned by Dr Dyno and now no pop.
@@rogershipman3578 who's dr dyno?
I have decel pop and my bike is tuned to the max by dyno. I also have a Manufactured Shorty Scrambler 2-1 pipe. Bike has character. Even stock Japanese bikes do it with almost silent OEM mufflers. Popping tells me the bike is doing it's job.
👍
Love My decel Pop , good to know it's not damaging . I don't run My Bike lean . Thinking I will try the " Thunder Torque Inserts ...
Right on, there are still a lot of us that like decel pop, though those that don't seem very vocal.
I think you will be well pleased with the bump in low and mid range power with the Thunder Torque Inserts.
Loving my pop!
👍
I'm with you Gray beard, I like it.
Thanks man.
Love me some decel pop. It's Jake brakes for a bike. ( sound wise)
Yep!
Perfect analogy 🤘🏻
Love my dcell pop...its just right to sound..BADDASSS
@@t.t.kelsey7132 👍👍👍
I love you guys. Great video. Just put a cobra slip on on my SportGlide and the decel pop became a lot more apparent. Now I understand why. Still going to purchase the TTI to reduce reversion and maybe decrease the decel pop a little bit to my liking. Which size TTI do I need for the cobra pipe?
Here is a link to a report to help you know what size TTI you need - www.dkcustomproducts.com/choosing-the-right-size-thunder-torque-inserts.htm
You can also email us a picture looking into your exhaust and the measurement of the inside diameter of your exhaust about 1.5 - 2" in and we will let you know what size to get.
Support@DKCustomProducts.com
I believe that you will really like them!
Lets us know what you think once you get them installed and get some miles out of them!
Also here is the link to the Thunder Torques if you would like to read through any of the information on them - www.dkcustomproducts.com/catalogsearch/result/?q=thunder+torque
Thank you for commenting!
Great men! best video about subject.
Thank you, happy you enjoyed.
My street triple r loves to do this sick video guys
Nice! 👍🏍👍
I talked to oil company representative about octane. He said octane is graded in levels of tenth. So if octane raises one % that rally means 1/10. So, I started adding ten times more treatment, to where the motor was running at seemingly maximum performance or "Hot" with diesel deceleration pop so extreme, I felt I needed to add some gas to reach that max performance! What I'm saying here is, octane boosters had a real impact on decelerating pop! But I use that pop as a mixture guide!
Very interesting, thanks for the comment. 👍
@@DKCustomProducts yeah, I thought to raise an octane meant from 87 octane to 88 octane, but it doesn't! It means= 87.1 octane.....to 87.9 then changes up to 88 octane. If you add enough octane you can definitely feel where engine runs at its best, then even feel overdosed with octane can have Pops, & even flames out exhaust! So, I actually use premium fuel, but know it's not near as good as fuel in the 60s, so, I research each bike until I know how it likes to run best, then add octane boosters accordingly at gas stations!
I tuned the PCIII on my CBR to give a nice long decel crackle and pop and I freaken love it. Cant understand why some ppl like to tune it out. High end sports cars like Porsche and BMW race cars do it from the factory.
And it was the opposite of what I understood, I had to lean out the tune in the midrange to get it to pop, not richen it like I would have thought.
Yeah, it is just a matter of getting the AFR right in the pipes. Sometimes it needs to get a little leaner, sometimes a little richer.
@@DKCustomProducts thanks, by far the best video I have seen on decel pops. I wasn’t sure if I was going to hurt my bike doing it but I’ll keep an eye on the temp gauge and throttle response. And if it blows up I have other bikes lol.
So I have a TC 96” with super e carb, teardrop air cleaner and VH bigshots exhaust. Running .031 intermediate and .076 main and a hell of a lot of decel pop. Bikes runs good , and has good throttle response. Should I be using different jets?
Each bike is different and it has been over a decade since we've spent any significant time jetting bikes, (even if we had, need to be with the bike and working on it to know for sure if a jetting change is needed).
We do work with CV-Performance.com and you may get some good info from them.
If it is running good, no stumbles, it would seem you are dialed in.
With your bigshots, use the TTI's at the link below. They will improve your low and mid range power, also will reduce the decel pop some.
www.dkcustomproducts.com/thunder-torque-inserts-c57-241.htm
My cars do it. So it must be fine. And it sounds awesome!
What cars do you have?
Love the color of the bike. Have the exact same one
👍😎👍
I found that slowly bringing down my rpm before I stop works for me
Good point. That is what some of the different tuning strategies use..you are doing in manually.
Those tuning strategies feed extra fuel into the intake, even if you have let up all the way on the throttle.
By doing that (via computer, or manually) you are changing the AFR in the exhaust, making it so rich that it will not ignite and create any popping.
Thanks for your comment!
The "pop" is unburnt fuel being burnt after the exhaust valve. That's a given. There is one obvious omission: PAIR. PAIR introduces fresh air directly into the exhaust after the exhaust valve. This introduction is (obviously) deliberate and is for emission control. I believe PAIR was introduce on the Japanese bikes (I have no research to that effect). You are correct, the "pop" is not a damaging thing, and as yourselves, I do really like that crack. Bear in mind, that by running the engine richer with a PAIR system, there may be excessive "pops". PAIR/"pop"/blanking PAIR - has absolutely no effect on engine performance (4-stroke) and could possibly negatively affect any cat/conv down the line.
Thanks for a great video production.
Glad you like the videos! We do not know of Harley using PAIR in any of their exhaust, yet.
Thanks for commenting! 😎 MB
Thanks! I was living a nightmares with .
Glad we could help!
I have a 2008 Victory Vegas with Bassani Pro Street Turn Outs. I do have decel pop and would like to minimize it. Will your TTI's help or make a difference.
Yes, they stop/reduce reversion. A side effect is that also change the AFR in the exhaust, and it will reduce/eliminate your decel pop. 👍
www.dkcustomproducts.com/thunder-torque-inserts-c57-334.htm
Gotta say you guys are always helpful, so here is a question : Ive got a 2003 TC 88 with the 606 EBS Stg 1 aircleaner and a well setup carb and because "I love the sound", Big Radius exhaust. At 10k I checked CRO and it was only .0025, so I installed a S&S 509g complete camchest set. I decided on this, rather than the 510s, because I like the lower to mid rpm range for my style (2500-4500).. Because the Big Radius 2 into 2 are a higher rpm exhaust its preventing me from getting the full potential out of my setup.. Here is question.. Im about to pull trigger on possible $1000, 2 into 1 exhaust.. Which would you guys suggest ?
For under $50 you can get some Thunder Torque Inserts™ that will bring back your low and mid range Torque, PLUS some! I would give that a try first and see if you are happy with it.
The 2-1 may bring back the low and mid range almost to as good as your current 2-2 with TTI's.
Of course, the 2-1 with a TTI would be even better low and mid range Torque...but only you know if it is worth $1000 to you for that little bit extra.
Check out this vid on the subject- ruclips.net/video/pr6z00gL5Yg/видео.html
@@DKCustomProducts Thanks for getting back with me.. Which TTIs would I order for my V&H Big Radius 2 into 2 exhaust ?
@@FreeSwimmer Double check the chart below, but I believe if you leave the baffles in you would need the 158's and if you remove the baffles you would need the 258's.
Link to chart here- www.dkcustomproducts.com/media/wysiwyg/tti_size.jpeg
For any help with the chart, give Dwayne a Call or email at
662-252-8828 or Support@DKCustomProducts.com
@@DKCustomProducts Hello there. I just ordered the TTIs #118 x 2 for my 1 7/8inch Big Radius 2 into 2 exhaust.. I looked all over for discount code but no luck. I have got tank lift / 2 - 606 Stg 1 w EBS / and these TTIs.. You have parts I can make myself, however your service and quality manufacturing is money well spent. Perhaps we can do a before and after TTI video ? Let me know.. I have a local Tech that is awesome and we could be ambassadors of DK Customs if you like ?
My fuel injected 04 FLHT with big bore kit, bigger cams, HD race tuner and V&H true dual straight pipes with no baffling pops like crazy when down shifted or going down hill at 0 throttle. It also pops sometimes during shifting. My dealer has dyno tuned it a few times and reduced it some. It’s been like that for 15 years and 100,000 miles.
Yep, sounds normal, not doing any damage. If you would like to pick up some low/mid range torque, check out the Thunder Torque Inserts™ at this link- www.dkcustomproducts.com/thunder-torque-inserts-c57-334.htm
Exhaust will be a bit deeper, may reduce decel pop a bit, but will definitely increase the low and mid range torque.
@@DKCustomProducts I ordered a set after I posted this. I can’t say I’m not skeptical, but I’m gonna try them out and see.
@@ericbishop1161 Good deal man, we are confident you'll be pleased with them. We appreciate your business. There will be enough gain in torque that you can feel it with your butt dyno lol. Ride safe!
Hi Guys have just found your channel, watched this video and the other one explaining the reason for decel popping thoroughly enjoyed as it made a lot of sense.
I have a 2017 FLSTC Heritage Softail with Twin slash 3" slip ons fitted that decel pop a lot and mates riding behind me always comment on the smell of fuel coming from my exhaust.
Would you recommend Thunder torque inserts to fix the decel popping problem
Thanks for watching our videos, and glad you are enjoying them.
Yes, the Thunder Torque Inserts™ will reduce/eliminate the decel pop. You will have more low and mid range power, so you will not need to twist the throttle so much to get the same forward movement. So you should have less of a gas smell.
Don't know what, if anything, you're running for a tuner...but if there is still any gas smell, you may still be a bit rich. But the likelihood is that it is just incomplete combustion, due to the reversion, and will probably be gone once the TTI's are installed.
@@DKCustomProducts Thanks Guys for the quick response, i will order the TTI's and think about a tuner after the TTI's are installed. What tuner would you recommend
@@deanmcalpine3678 I think you will be well pleased with the benefits you get from the TTI's.
For a tuner, it depends on what you want and your budget. If you are happy with your bike and are not doing more than a Stage I and want to get the best bang for the buck, the FL-VIED is the most benefit per dollar spent.
Top of the line Tuner with ability to handle all upgrades is the Power Vision.
If you like working with your Smartphone and want to do a Stage I or a Stage II and get great tune, the FP3 is good.
You can see all three tuners at this link- www.dkcustomproducts.com/efi-tuners-c74-241.htm
And there is a good Article/Report/Overview of all the popular choices at the following link. I would recommend reading it and then making an informed decision, based on your desires and budget.
www.dkcustomproducts.com/overview-of-efi-optionsxied-piggy-back-flash-tuners-dyno-ov-efi-opt.htm
Right so I own a gilera runner st125 with a malossi 218 kit installed with a malossi aftermarket exhaust and it shoots flames out the exhaust on deceleration when I let off the throttle could you please tell me how to fix it cause I don’t want it to damage my engine?
Man, I wish we could help, but we are completely unfamiliar with that bike and with the mods you have done.
Generally speaking, anything happening in the exhaust is not going to hurt the engine...all of that activity is happening after the exhaust gasses have left the engine. Perhaps some Thunder Torque Inserts™ will change the AFR in the exhaust (does not change the AFR in the combustion chamber) so there are not flames.
www.dkcustomproducts.com/thunder-torque-inserts-c57-334.htm
Been using my nh with crossover eliminator, do you have a suggestion for a 2 into 1 deeper sound slip on!
We did an entire video on this, you can see it here- ruclips.net/video/H681dl2X_f4/видео.html
I had decel pop on my stock 03 dyna and it was attributed to lean condition. Added big Radius exhaust and your 606 aircleaner kit with EBS and had carb worked by tech, after S&S 509g camchest upgrade, and voila it runs explicative explicative great now.. Rarely is there an audible pop.. But Im not a fan of a hard rev and then letting wind down..
Appreciate your business, great to hear that you have the bike running how you want! 👍
My stock 04 fxd has it, but you havento down shift really high to get it good
Dunno what you mean by really high rpm...careful of that valve train.
i have a softail slim and removed the baffles . it popped twice in about 500 miles, any issues with that?
Copy and pasted from our Harley Exhaust Report:
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
Decel popping is NOT indicative of a bad tune.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed). It can also occur if there is an exhaust leak that is introducing extra air into the exhaust tract.
You can see the entire report at this link- www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm
Since you have removed your baffles, if you will put some Thunder Torque Inserts in them, you will get a little deeper tone, and you will have a very nice bump in low and mid-range power. You can see them at this link- www.dkcustomproducts.com/thunder-torque-inserts-258-model-family-dk-tti-258.htm
Feel free to email or call with any questions.
support@dkcustomproducts.com
662-252-8828
Do stock headers allow popping. I got a used bike w a big sucker and slip ins and it’s a beast and has POWER and it pops like crazy like a tuned car lol
Glad you're enjoying your ride!
You might find this video interesting/useful- ruclips.net/video/pr6z00gL5Yg/видео.html
My FP3 app allows me to select the decel pop factor by choosing the 'firecracker' icons. V&H say that if you select more firecrackers, you get less decel pop, which doesn't make sense. I would have thought that choosing less firecrackers would minimise the decel pop.
Yeah, they're sort of counter-intuitive. Their thinking is that folks want to get rid of the decel pop, so you choose how much you have...just a little is one firecracker, medium amount is 2 firecrackers, a lot is 3 firecrackers. The more firecrackers you choose, the more fuel they add in at zero throttle, changing the AFR so reduce/eliminate decel pop.
hope to catch you. 1990 HD Evo XLH 1200. Screaming eagle and hi flo air. Any advice on 'rapid acceleration / deaccelaration pop, and i mean serious carb and exhaust flame' a bit dramatic. I've tuned to 10.5 low tick over rumble and it idles easily at low revs. I know not easy to advise over web. here's hoping. Hello from Scotland. Forfar near Harley Davidsons Original Family Home area. Cheers
Is it popping out of the carb on acceleration?
A rough rule of thumb is that a lean mixture will backfire through the carb and a rich mixture will backfire through the exhaust.
Having said that, adjusting the idle mixture screws will change the mixture at IDLE and slightly off of idle. Once you open the throttle, the mains start flowing and the adjustment of the idle mixture screws is pretty much irrelevant. If the popping is at idle, then it might be the mixture screws. If it's at part throttle, it's something else...like an intake manifold leak.
Thanks for commenting! KP
My royal enfield continental gt pops a lot and I like the sound
Yep, there are a bunch of folks that like decel pop. 👍
My bike began popping until I found a leak in carb& manifold bracket seal causing bike to run too lean and hot. Change seal - problem solved . But it did sounded cool 😎!
Yeah, some people like the pop some don't! Glad you found the issue!
Thanks for commenting!
With a CV if you set the idle low it will pop with the throttle shut. You can check by opening the throttle a fraction. Start from high idle 1100 and back it down until you get the amount of decel pop you like. I have a big sucker fueling 525 and Vance and Hines straight shots. Guaranteed a low idle will get you all the pop you want with a CV. Don't know about EFi, never had it.
Glad you have your bike running how you like it! Thank you for commenting! MB
I have the rush slip ons with a 2 inch baffle with a free flowing filter and use the fp3 controller on my sportster. I have gotten a code of the front cylinder being to rich and have developed a deceleration pop. This hasn't happened before.
I suggest you call V&H and let them know what bike you have, what is installed on it, what tune you're using, and what tune they recommend.
@@DKCustomProducts I've tried but no one ever answers the phone.
@@naturalforlife6741 Well, that's a bummer. We usually have no trouble getting them on the phone. Anyway...here is what you can try-
Hook up your FP3 and reload your original tune. Start it up, let it run 10-20 seconds.
Then clear the codes.
Then reflash the tune that you have run successfully in the past.
It does not happen often, but sometimes a tune will get corrupted and it just needs to be reflashed.
@@DKCustomProducts Thank you I will try this.
My 2004 sportster 1200 had no deceleration pop until last week. No changes were made to the bike. It just started excessive deceleration pop out of the blue. Any suggestions?
Assuming a baffle hasn't come out, most likely you have an intake or exhaust leak. If it still runs well, go over the exhaust first and go from there.
Thanks for commenting! 😎
02 victory v92 pops fuel injection kick nd of like that sound when I had an hd sporty off set fuel bowl will do the same
Thanks for the comment...don't understand what you wrote, but glad you're here.
What if I put new pipes on my bike take the baffles out and don’t tune it will that be bad for my bike ? It’s carbed and has the stock air cleaner I want the decel pop so I got new pipes ? Is it bad or no
Good question. Decel pop is not bad in and of itself. However, on a carbed bike, the likelihood of it needing to be rejetted is high. Also, you are going to loose a bunch of low and mid range torque doing that, unless you put some Thunder Torque Inserts™ in those empty slip ons. See a video about that at this link- ruclips.net/video/pr6z00gL5Yg/видео.html
What about backfiring? (Or shall I say, Afterfire for the correct term). My Honda VTX 1800 always had a very noticeable amount of decel pop but recently it started Backfiring (Afterfire) on deceleration as well.
Generally, when you have afterfire it is from an intake or exhaust leak, or from running to rich.
Love my decel pop
🏍💨🔥💥
As do I mine. 😎👍
I love hearin her talk back to me
Yeah, that is a great way to put it. 👍
I had pretty good decel pop on my 2011 Street Bob Stage 2 103 until I changed the plug wires. I still have the pop, but not as pronounced as it was before.
Interesting. Good point. Plug wires are not all created equal, and some will cause less burn in the combustion chambers, putting more unburnt fuel into the exhaust.
Travis, you didn't mention what brand of wires? If they're Screaming Eagle, it's because they are not that good. Not my opinion, but a FACT.
Plug wires are rated by OHMS PER FOOT. Most wires are not much better than O.E.M., but they sure are perty.
Find some rated at 50 OHMS or less, and I guarantee you that you'll be glad you did. Always put a little dielectric grease on the inside of the boots, and be sure to check that the spark plug nipples are tight, if they're threaded. Copper anti-seize on the threads, NOT aluminum.
Yes I'm a Harley Engine Builder and Dyno Tuner.
Good luck brother.
T.S. RACING
@@t.s.racing I'm not sure what brand the old cables were, but the new ones are the SE brand. I was in a pinch because the old cables broke and I needed new ones. So far they've been good, I've had them about a year. My spark plugs are 3 years/17,000 miles old. Recommendations on better cables??
I've never had decel pop from my fatbob but I was wondering about this because I want to upgrade my cams and I've been told this could happen, I did have this issue with my vtx1800 and after I de-smogged it and removed the rede valves the issue went away and I gained a little more torque
Now you know. Thanks for watching and for the comment.
Have you guys ever tuned a carburetor?? I've learned a lot tuning those. In my experience, decel pop is because you are running leaner at idle. You can check the spark plugs after running at different throttle positions, black plugs being rich, white dry plugs being lean. When I adjust my idle mixture, the popping goes away and my spark plugs look good. So check your spark plugs when in doubt!
Of course there could be other factors that affect decel pop, but that just has been my experience.
Yes, that is all we used to do. When dragged into the EFI world (kicking and screaming) it is very different. Can't really read plugs on an EFI bike, especially with the new gasoline.
@@DKCustomProducts ahh good to know, I have never messed with EFI, people think I'm crazy for wanting carburated bikes, but I understand and can physically can see what's going on with generic tools..... I know, I know... I'll come around to messing with EFI at some point with motorcycles lol
I ride a 09 streetglide with an s&s 124 and a carb conversion s&s super g it seems like with high compression it needs more octain i run 110 race fuel half and half with 98 octain gas and it runs badass and does pop and cackle on decell also d&d borezilla exhaust is wide open but big power bikes need more fuel on the top so they dump alot at the bottom nature of the beast
Sounds like you have your bike dialed in for you and like it would be a fun bike to ride! Thanks for commenting! MB
Had the restrictor taken out of the stock HD muffler on my 2023 HD Road Glide CVO recently. Immediately had decel pop where none was noticeable before. Your video really helped me be at ease about it.
After a few rides, allowing the ECM to make adjustments, the decel pop has disappeared. Now, after a deep dive into your videos, I’m seriously considering installing TTI’s in the mufflers to get the performance boost.
But now I’m confused because in this video you mention if you don’t have any decel pop, installing the TTI’s could cause it to happen.
Any thoughts?
@dkcustomproducts
Installing the TTI's will give you a boost in low-mid range torque. If you are not experiencing decel pop installing the TTI's can cause decel pop because it changes the AFR. Decel pop is not bad for your bike.
If you do not like the decel pop you can get the bike tuned so that the decel pop does not happen.
Here is a written report on exhaust that you may find useful/interesting - www.dkcustomproducts.com/harley-exhaust-myths-and-facts.htm
Here is the link to the TTI's if you are interested in reading more about them- www.dkcustomproducts.com/catalogsearch/result/?q=thunder+torque+inserts
Please feel free to contact us with any questions;
Support@DKCustomProducts.com
662-252-8828
Thank you for commenting! 😎MB
@@DKCustomProducts Well I spoke too soon. Went for a ride today. I can definitely still force some serious decel pop on a hard down shift. Gonna give the TTI’s a try ASAP. Thanks guys!
You are most welcome!
Feel free to contact us with any questions you might have;
Support@DKCustomProducts.com
662-252-8828
Thank you for your business and for commenting! MB
I removed the catalytic converter and installed an X-pipe on my Triumph Bobber. They tuned the new setup. The deceleration burble is slightly louder, but I notice a stronger smell of gasoline. Any ideas?
A catalytic converter gets so hot and burns off the excess exhaust gasses. It is possible that without it, you are just not burning off the gases as much as you did before.
It is also possible that you could be running a little rich. If you notice a loss in power you may be tuned a little rich. Here is a video on a FAQ about catalytic converter removal that you may find interesting/useful- ruclips.net/video/ks39Gwb3NdI/видео.html
Thanks for commenting!
my car does this. it has a custom exhaust and weber carbs. the exhaust pops and crackles when im off the accelerator and coasting, if i richen the idle mixture it goes away but at idle the mixture is very rich and the pistons and plugs get full of carbon. i wish i could get rid of the sound without having overly rich mix at idle
Use some TTI's. The will change the AFR in the exhaust, by reducing reversion and increasing exhaust gas velocity. This will improve power and reduce/eliminate the decel pop.
More details on them here- www.dkcustomproducts.com/thunder-torque-inserts-258-model-family-dk-tti-258.htm
I have corba pipes on vtx after watching this video I love the pop know and it spit flames
Glad you like the video and your decel pop! Thank you for commenting! MB
My 107 M8 is tuned on E85 and has a Map for Race and 91 I have 0 decel pop with perfectly balanced cylinders as far as AFR goes. I’ve heard horror stories about decel pop and Harleys maps from the factory. My 2020 baggers stock spark plugs with only 5k miles on them at the time were so over heated and the grounding back strap color was so off towards advance. The EPA is ruining these bikes from the factory
Good to hear you have dialed in your 107. Yep, the heat generated to meet epa guidelines is a killer
The old adage is that if it pops thru the carb it's lean, and it's rich if it pops thru the exhaust, but tuning and gas quality can do the same.
True that on carbed bikes, more often than not. EFI bikes, not so much.
Decel Pop SAVES LIVES!
It surely can. 👍
Love the race car analogy. If it doesn’t at least “gargle” when shifting, why own a Harley? 😂
LOL!
I run a 1275cc Sportster with a Mikuni and the jets recommended for my head/cam setup and straight drag pipes as per Hammer performance. I don't get the decel pop that sounds like fire crackers, instead I get a "thump, thump.. thump" sound similar to pulling a cork out of a large bottle. So I'm unsure whether it's lean/rich or just right.
You cannot do better than the advice from Hammer Performance on one of their kits.
A general rule of thumb is that if it pops out the pipe it is too lean, if it pops (farts) out of the carb it is too rich.
You can fool around with the jetting and go by the seat of the pants, or you can put it on the dyno with some sniffers and see the actual AFR at different throttle settings and loads.
@@DKCustomProducts the reason I dropped a jet size is because I had raw fuel accumulated on the tips of my pipes. So I now have dry pipes but the "milk jug" thump so I'll play with the air screw a little and see how it goes.
@@6sillygtivr Good deal.
Hi, Where Have You Installed TTI on a Fishtail Pipe, Without Baffles. Can You Add Few Pictures, Please, I Have Straight Fishtails on My Road King, Can We Install Them in the Middle, Towards the End Fishtail Is Quite Hard to Reach. I Wait for Your Reply, Thanks
With the Samson pipes I have, the tails are removeable and we put them right at the end of the pipe, before the tails. You can see and hear in this video- ruclips.net/video/GuIgK-rc2s4/видео.html
On Fishtails where the tail is not removeable, sounds like you are doing the best you can.
@@DKCustomProducts no I didn't have Sampson pipes. I have 36inch slip on from vtwin. So what are my options. I read on tab performance we can put them on header pipes. I am confused now.
www.tabperformance.com/Reduce-Back-Pressure-Exhaust-s/203.htm
@@sikhbikersoflondon The closer you put them to the end, the better. If the middle is the closest you can get, they will definitely help.
Reversion begins at the very end of the tail pipe, so the closer you are to the end, the faster your exhaust gas velocity will be (which is good for performance). Having them in the middle will stop the reversion in the middle, which is MUCH Better than not stopping it at all.
@@DKCustomProducts thanks a lot for confirmation.
One key things you guys totally missed, bad exhaust gaskets!
They can cause popping too, say a guy swaps pipes, or suddenly started getting more or less popping. Could be an indicator of a bad exhaust gasket or not getting a complete seal at the head.
Man, did that not make the edit? We did talk about it...always check for exhaust leaks...leaks at the gasket or where the mufflers slip on to the headers. Like Drew says, if air is being introduced at either of those places it will change the AFR in the exhaust.
Great comment! Thank you.
Im going to run a mpg test with the decel pop and then run it again without with the tuner. Both on a tank of gas
That'll be a fun test. Let us know what you find.
My 14’ street glide stage 2 always pops on deceleration.
Don’t bother me at all.
I actually like it.
And it IS properly tuned
Cool, glad you're bike is running well and you are enjoying it.
Question, i started my 07 vstar 650 silverado was sitting in the cool garage for a couple days
Had to choke it a few times mid and full choke and held the throttle to keep it going then once it was idling on its own I let it warm up for about 10 Minutes I was revving it up and it it would pop out the exhaust when I let off the throttle a blue flame would shoot out a lil bit is that ok ?? Bike runs well and revs up no problem would that maybe be because I had to choke it a bunch ?? Prior to starting it thanks a bunch
Thanks for watching and the questions.
We're not familiar with that engine....dunno why you had trouble starting it...could have been very cold, could have been some bad gas...not possible for us to know without being with the bike.
You might be a bit rich, but a blue flame out open exhaust is not uncommon, and is not indicative of a bad tune.
I would recommend looking at the Thunder Torque Inserts™ at the following link. It will run stronger, and have a bit deeper exhaust tone.
www.dkcustomproducts.com/thunder-torque-inserts-c57-296.htm
@@DKCustomProducts thank you just got the bike back from dealer they re did the carbs cleaned them etc and it is cold here in Canada plus 4 yesterday and today is minus 1 just fired it up again. Was hard starting had to use choke and little throttle to keep it going until it could idle by itself
@@jacobboyko888 Was it cold before the dealer worked on it? Did it run like this before the dealer worked on it....if not, then I would suspect they have some more work to do.
@@DKCustomProducts no the bike was back to them 3 times I bought the bike from then last summer at the end long story short all it would do was fire and quit and wouldn't run evertime I went to pick it up it would run good then I'd get it home and it would be back to the same thing . This is the first time the bike had been running and that I've been able to start it etc. I live on the farm so it gets parked in the garage. And yes the bike was inside when they worked on it what are you suspecting ?
I had it really bad on mine. I went to a hotter burning plug and reduced it to the point it doesn’t bother me
Glad you are happy with your ride! 👍
Pipe length actually affects AFR too.
It certainly does affect the AFR in the pipes, as does shape, diameter and many other factors.
I got vs1400 and fully tuned with pods and supertrapps and oh boy, it P-O-Ps
👍 Thanks for sharing!
Kevin, thank you for the video but I am amazed that you wanted decel popping on your scooter......to me that sounds horrible. But as they say........'to each his own' I reckon.
Glad you enjoyed. Yep, everyone's ear is different. I like a somewhat predictable decel popping...it just pleases my ears. I do not like an incessant rapid fire or unpredictable decel pop...just does not please my ears...BUT, I know guys that do like that kind of decel. And, of course, I know many folks that do not like decel pop at all.
I love the decel pop
Music to my ears also! 👍
I like a good cackle from my bike but a pop to me is a backfire witch I don't like. I guess it depends on how you interpret a deceleration pop.
Yes, I like the sound that is a mix of a burble and a cackle. A steady stream of sharp cracks, or what sounds like a backfire, is not pleasing to my ear.
But everyone has their own sound that they like. 👍