Slip-on: Exhaust Popping?

Manimal · October 1st, 2014, 05:58 AM

As some of you may know, I had recently acquired a 300, used. It came with a Yosh slip-on already mounted. Any how, when rolling off the throttle, I hear an occasional popping ...... something similar and very common when upgrading the exhaust on the new gen 250; which required jetting or shimming, and or removing some emission plumbing.

Anyone know a fix for this?

BlownWideOpen · October 1st, 2014, 06:14 AM

Flux capacitor

thisisbenji · October 1st, 2014, 06:23 AM

You know.... some companies go through extra trouble to have their vehicles pop on deceleration. Ever hear an F-Type?

Hero Danny · October 1st, 2014, 06:40 AM

The popping I believe is because the exhaust makes your bike too lean. Only way to fix it would be a power commander to adjust the fueling map.

On a side note: I like the popping sound, especially when deceleration, my mussari did that... I really need to get a slip on for my 300.

BlownWideOpen · October 1st, 2014, 06:52 AM

I like the popping too, I removed my KLEEN air system on my bike and thought it'd kill it. But now it's crazier than ever, sounds like a banshee.

Malicious Logic · October 1st, 2014, 06:52 AM

I love the popping. Used to happen on my 250 with the 2 bros slip-on and my mustang pops pretty regularly.

Definitely think it's a bit funny that so many people strive for it and you're trying to get rid of it.

LittleRedNinjette · October 1st, 2014, 06:53 AM

Mine does it all the time (i have a two brothers slip-on). Feather the clutch a bit as you roll off the throttle and it stops. Not sure if there is a true 100% "fix" for it. I don't mind it myself, its not hurting anything i know of.

If it dose not have a power commander i would highly recommend getting one and mapping it for your pipe.

mania · October 1st, 2014, 07:02 AM

Quote:

Originally Posted by Manimal

As some of you may know, I had recently acquired a 300, used. It came with a Yosh slip-on already mounted. Any how, when rolling off the throttle, I hear an occasional popping ...... something similar and very common when upgrading the exhaust on the new gen 250; which required jetting or shimming, and or removing some emission plumbing.

Anyone know a fix for this?

Actually all bikes pop but with the stock exhaust so heavily baffled you do not hear it.

Even if you put in a power commander/dynojet etc. EFI controller you will likely still have some popping on deceleration because the lack of baffling will let you hear it.

But.....If you want to decrease it to almost unnoticeable just close the throttle all the way when decelerating.
Try it you will see how well it works.
most dont realize they have it slightly cracked open even when they decelerate & think they are off throttle.

Just try it as it is easier done than explained. You will see a big improvement/reduction in popping

Somchai · October 1st, 2014, 07:14 AM

Quote:

Originally Posted by mania

But.....If you want to decrease it to almost unnoticeable just close the throttle all the way when decelerating.

subxero · October 1st, 2014, 10:16 AM

popping can be a symptom of an exhaust leak.

check all exhaust gaskets, joints in the pipe, ect...

alex.s · October 1st, 2014, 11:04 AM

when you close the butterfly valve it chokes on air. extra fuel goes past and doesn't burn and hits the hot exhaust pipe where there is a tiny bit of left over oxygen (compared to inside the cylinder where there is none left) and has a very small backfire. normally you don't hear it because of the heavy baffling in the stock exhausts. the extra fuel going through actually helps cool the valves when engine braking.

JohnnyBravo · October 1st, 2014, 04:03 PM

My exhaust sounded like 💩 till I changed to a high flow air filter... Probly not your issue, just on topic

JohnnyBravo · October 1st, 2014, 04:06 PM

Quote:

Originally Posted by LittleRedNinjette

If it dose not have a power commander i would highly recommend getting one and mapping it for your pipe.

The fuel moto is better

tfkrocks · October 1st, 2014, 04:38 PM

I had popping with the stock exhaust and I still have popping now with an aftermarket full exhaust with PCV. It amuses me so I don't worry about it *shrug*

JohnnyBravo · October 1st, 2014, 06:39 PM

I don't think I've ever heard a bike that didn't pop in one way or another... Just wait till your bike shoots flames out the pipe

Manimal · October 2nd, 2014, 08:11 AM

Quote:

Originally Posted by BlownWideOpen

Flux capacitor

Only if I wanna sh*t myself anytime I wanna crack the throttle above 55+mph ..... lol

Thanks for the responses and insight as to why. FWIW, I have read posts that for a slip-on, an ECU change is not necessary. Any case, seems more common than not. Honestly, it doesn't bother or really concern me. And yes, it does add some additional character from the pipe, aside from the throaty rumble.

BlownWideOpen · October 2nd, 2014, 08:26 AM

Quote:

Originally Posted by Manimal

Only if I wanna sh*t myself anytime I wanna crack the throttle above 55+mph ..... lol

Thanks for the responses and insight as to why. FWIW, I have read another posts that for a slip-on, an ECU change is not necessary. Any case, seems more common than not. Honestly, it doesn't bother or really concern me. And yes, it does add some additional character from the pipe, aside from the throaty rumble.

Throaty rumble? Sounds like... never mind.

October 1st, 2014, 05:58 AM	#1
Manimal ninjette.org member Name: Daren Location: Milpitas Join Date: Nov 2009 Motorcycle(s): 2013 Ninja 300 SE Posts: 106	Slip-on: Exhaust Popping? As some of you may know, I had recently acquired a 300, used. It came with a Yosh slip-on already mounted. Any how, when rolling off the throttle, I hear an occasional popping ...... something similar and very common when upgrading the exhaust on the new gen 250; which required jetting or shimming, and or removing some emission plumbing. Anyone know a fix for this?

October 1st, 2014, 06:14 AM	#2
BlownWideOpen ninjette.org guru Name: Artie Location: Canada Join Date: Mar 2013 Motorcycle(s): Stuff Posts: 284	Flux capacitor __________________________________________________ Paint side up, rubber side down!
	1 out of 1 members found this post helpful.

October 1st, 2014, 06:23 AM	#3
thisisbenji ninjette.org sage Name: Benji Location: Wadsworth, IL Join Date: Aug 2011 Motorcycle(s): 2009 Ninja 250r (Sold), 2009 FZ6, 2015 Honda Grom Posts: 898	You know.... some companies go through extra trouble to have their vehicles pop on deceleration. Ever hear an F-Type? __________________________________________________ My Old Bike My New Bike
	1 out of 1 members found this post helpful.

October 1st, 2014, 06:40 AM	#4
Hero Danny Inline 4!!! Name: Danny Location: MA Join Date: May 2014 Motorcycle(s): 2008 CBR600rr, 1987 KLR 250 Posts: A lot.	The popping I believe is because the exhaust makes your bike too lean. Only way to fix it would be a power commander to adjust the fueling map. On a side note: I like the popping sound, especially when deceleration, my mussari did that... I really need to get a slip on for my 300. __________________________________________________ Be careful. Remember you are invisible

October 1st, 2014, 06:52 AM	#5
BlownWideOpen ninjette.org guru Name: Artie Location: Canada Join Date: Mar 2013 Motorcycle(s): Stuff Posts: 284	I like the popping too, I removed my KLEEN air system on my bike and thought it'd kill it. But now it's crazier than ever, sounds like a banshee. __________________________________________________ Paint side up, rubber side down!

October 1st, 2014, 06:52 AM	#6
Malicious Logic hates stupid people Name: Mark Location: Oklahoma City Join Date: Aug 2011 Motorcycle(s): 2005 ZX6R Posts: 860	I love the popping. Used to happen on my 250 with the 2 bros slip-on and my mustang pops pretty regularly. Definitely think it's a bit funny that so many people strive for it and you're trying to get rid of it. __________________________________________________ My vlogging channel: Ma1iciousLogic

October 1st, 2014, 06:53 AM	#7
LittleRedNinjette Certified Troublemaker Name: Teri Location: Hamilton, NJ Join Date: Oct 2012 Motorcycle(s): 2006 Ninja 250r "Pikachu", 2017 Ninja 650 "Epona" Posts: A lot. MOTM - Aug '13, Aug '14, Feb '17	Mine does it all the time (i have a two brothers slip-on). Feather the clutch a bit as you roll off the throttle and it stops. Not sure if there is a true 100% "fix" for it. I don't mind it myself, its not hurting anything i know of. If it dose not have a power commander i would highly recommend getting one and mapping it for your pipe. __________________________________________________ Raven's Rejuvenation A bruise is a lesson... and each lesson makes us better...

October 1st, 2014, 10:16 AM	#10
subxero dirty boy Name: Joe Location: Johnstown, PA Join Date: Sep 2012 Motorcycle(s): I don't even know anymore?? Posts: A lot. MOTM - Apr '14	popping can be a symptom of an exhaust leak. check all exhaust gaskets, joints in the pipe, ect... __________________________________________________ I love the smell of burning pre-mix in the morning I don't think I'm a lot dumber than you thought that I think that I thought I was once.

October 1st, 2014, 11:04 AM	#11
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	when you close the butterfly valve it chokes on air. extra fuel goes past and doesn't burn and hits the hot exhaust pipe where there is a tiny bit of left over oxygen (compared to inside the cylinder where there is none left) and has a very small backfire. normally you don't hear it because of the heavy baffling in the stock exhausts. the extra fuel going through actually helps cool the valves when engine braking. __________________________________________________

October 1st, 2014, 04:03 PM	#12
JohnnyBravo Certifiable nontundrum Name: Harper Location: NC Milkshake stand Join Date: Mar 2013 Motorcycle(s): 2013 SE NINJA 300 Posts: Too much. MOTM - Sep '13, Sep '16	My exhaust sounded like 💩 till I changed to a high flow air filter... Probly not your issue, just on topic

October 1st, 2014, 04:38 PM	#14
tfkrocks ninjette.org certified postwhore Name: Rebecca Location: SF Bay Area Join Date: Sep 2009 Motorcycle(s): 2013 Ninja 300 w/ ABS, 2014 NC700X, 2008 Ninja 250 (sold), 2002 Ninja 250 (sold) Posts: A lot. MOTM - Jan '18, Sep '13	I had popping with the stock exhaust and I still have popping now with an aftermarket full exhaust with PCV. It amuses me so I don't worry about it shrug __________________________________________________ My Ninja 300

October 1st, 2014, 06:39 PM	#15
JohnnyBravo Certifiable nontundrum Name: Harper Location: NC Milkshake stand Join Date: Mar 2013 Motorcycle(s): 2013 SE NINJA 300 Posts: Too much. MOTM - Sep '13, Sep '16	I don't think I've ever heard a bike that didn't pop in one way or another... Just wait till your bike shoots flames out the pipe

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