Popping on decel

[rb643]

Eversince I installed my Yosh slip on, my bike pops and backfires on deceleration or when I switch gears. Is it possible to completely eliminate, or significantly reduce this noise? From reading other posts about this topic, I installed a Dynojet kit and set it according to the instructions. It helped, but it still pops on deceleration, especially when going down hills.

Here's my setting: DJ138 mains, 3 turns out on mixture screws, clip set to 3rd from top on needles, and holes drilled on slides.

Thanks.

[dnakase]

It dose not bother me.

Maybe there is something to be said for being oblivious?

My guess it that it dose that with the stock can and jetting, its just so damn quiet in that config you don't notice....

I'd rather hear the rummble than the cam chain anyday.

[Gmoney]

here what i would do if i was you. i would desnorkel the air filter or buy a k & n. the snorkelectomy is cheaper and only take about 15 min. then increase your jet size to 144.

i have noticed that people with pipes who are useing the stock filter have these back fire problems.

i have a m4 pipe,desnorkeled filter and i dyno jet kit. the bike has never.... never popped or backfired once and i have ridden it for about 2000 miles.

also did you remove the smog breather hoses off the carbs and plug them off?

[Burst]

the only way to completely get rid of the pop is to disconnect the pair valve. It injects air into the exhaust ports, to burn off any unspent gasses. You just can't hear the pops with the stock can and its 5 baffles.....

I know Rick77f had good luck with the Factory Pro jet kit. Said it smoothed everything right out. Might give that one a try.

[TomSV650]

Try sealing your slip-on with silicone

[Gmoney]

i was thinking. i had the m4 pipe on for about 600 miles before i messed with the jetting or filter and it didnt pop once even with a couple small exuast leaks.

M4 rulessssssssssss. you bought the wrong pipe. the cattle ranchers in texas out designed the japaneze.

M4's dont pop

[Burst]

the can itself has very little to do with the pop....

put the SAME m4 on two different SV's, by same I mean take it off one SV and put it on another. One may pop and the other may not. It all depends on which tech built the bike and who has worked on it. Bikes are never exactly the same.

[rb643]

[
M4 rulessssssssssss. you bought the wrong pipe. the cattle ranchers in texas out designed the japaneze.

M4's dont pop [/B]

Ya ya ya....... I remember hearing your pipe on that one Palomar ride. It does sound mean.... :squid:

Well I tried the pair valve thing by disconnecting the small hose and plugging it. No luck. :( Rick had good luck, but like you said, no two bikes are exactly the same.

Guess I'll just try the other stuff you guys recommended.

[TomSV650]

When I changed my oil, the M4 had to come off and then it started to "pop". :mad: Took it off, siliconed it and it was fine.

I still thinks its the best pipe though, at least it sounds the best.:D

[Burst]

Originally posted by TomSV650
I still thinks its the best pipe though, at least it sounds the best.:D

Have you heard the Yosh RS3 full system on a SV? OMG, I can't imagine anything out there sounds better than that. Not for my taste anyway. I have heard the M4's they do sound very nice, but I will definitely be buying the Yosh. It just sounds badass. very DEEP, thump/rumble to it. Sounds like a Ducati(minus that damned dry clutch scraping/rattling noise hehe) If Nate shows at the Gathering next month you'll have to take a listen.

[Gmoney]

Originally posted by Burst
the can itself has very little to do with the pop....

put the SAME m4 on two different SV's, by same I mean take it off one SV and put it on another. One may pop and the other may not. It all depends on which tech built the bike and who has worked on it. Bikes are never exactly the same.


Hmmm. i would like to test your theory. it doesnt take much to remove the exhuast, maybe at the next wrenchfest. i could switch with someone's yosh that pops.

i think the exhaust plays a part, rb643 aka Rodger didnt have the poping before. pipe installed. now it pops. only thing different, the pipe.

i dont think the baffles in the stock pipe would stop the sound that much so you would never hear it. if your bike pops you should be able to hear some thing, with the stock pipe.

maybe human error, the tech theory is to blame, sound a little far fetched. But if so MY TECH's The Best WoooHoo!


Its probably just a leak at the connection points somewhere in the exhuast. Time for sealer.

[ersigh]

Originally posted by rb643
Eversince I installed my Yosh slip on, my bike pops and backfires on deceleration or when I switch gears. Is it possible to completely eliminate, or significantly reduce this noise? From reading other posts about this topic, I installed a Dynojet kit and set it according to the instructions. It helped, but it still pops on deceleration, especially when going down hills.

Here's my setting: DJ138 mains, 3 turns out on mixture screws, clip set to 3rd from top on needles, and holes drilled on slides.

Thanks.

hehe

i love your avatar!!

[bwarbiany]

For my money, twin Renegade's sound the best... Deep rumble, not too loud... Gotta love it :)

Brad

[91Vette]

Originally posted by Gmoney


i have noticed that people with pipes who are useing the stock filter have these back fire problems.

i have a m4 pipe,desnorkeled filter and i dyno jet kit. the bike has never.... never popped or backfired once and i have ridden it for about 2000 miles.

also did you remove the smog breather hoses off the carbs and plug them off?

My stock 01 SV650S has backfired a few times. I was noting this for when I take it in for the 600 mile service.

[TomSV650]

Don't think i've heard the Yosh RS3 version. But i'll say this, the M4 isn't all that loud putting around but when you get on it hard it barks! REALLY makes you feel like your the king of the road and ain't takin' no sheet from anybody!:mad: :p

Also from what i've read the M4 makes the most power. I dunno. Also FWIW, ive tried the stock filter, de-snorked filter(with the jetting that goes with it) and now i've got the K&N with the Dynojet jet kit and like the latter setup the best.

Sorry to get off topic here, but after front end work, a pipe and jetting is the best thing you can do to your SV.

[Gmoney]

Originally posted by 91Vette


My stock 01 SV650S has backfired a few times. I was noting this for when I take it in for the 600 mile service.

im wondering if thats because you have the 49 state model. that bike is different than the california model.

[91Vette]

Originally posted by Gmoney


im wondering if thats because you have the 49 state model. that bike is different than the california model.

True. I forgot that the California models get different emmissions controls.

[Gmoney]

Yeah, Cali has some anal smog laws. some of the toughest world wide.

[panick]

backfire is caused from a lean condition caused by leaks or jetting. my sv has a slight popping on decel, stock pipe.
it's a calif. bike.
while we are here, what's the general thoughts on the micron system? anyone have one, heard it?
cheers

[bwarbiany]

rick77f had a bad experience with Micron, but has admitted that he's otherwise heard good things. I've heard good things about them as well...

Brad

[Burst]

How do you figure backfiring is caused by running lean?

A backfire is unspent fuel being ignited in the exhaust. If the bike is running lean, how would there be enough UNSPENT gas in the exhaust to cause a backfire? My bike, stock can, stock jetting popped a little once in a while. So, based on the opinion of others, that you seem to agree with(many do) I put bigger mains and pilots in, also shimmed the needles and adjusted teh screws to 3 turns. I did drill a few holes in the baffle inside the pipe just to change the note a bit. Now, ask anyone that has had the interesting experience of riding behind me in the canyons. My bike backfires worse than any you have probably heard. It sounds like a canon going off.... I know that the few holes did not open up the flow of the exhaust enough to make my new jetting run even more lean than that of the stock set up. Too rich.

Last night I tried a little experiment with an old air filter. I performed a *half snorklectomy*. I cut out the tube and did not open up the filter anymore than the outer diameter of the tube. Now, my bike backfires less than before. The higher flow leaned out the mixture a little, but obviously not enough if the bike still backfires.

flame away. :D

[rb643]

Hmmmm........ I just noticed that my Dynojet instructions mentions something about popping on deceleration. Didn't notice it before, duh!!#-o Anyway, it mentions that if no leaks are detected in the system, turn the mixture screws out another 1/2 turn. That would make my setup 3 1/2 turns out. Does that sound a bit extreme? Everywhere I've read, 3 seemed to be the maximum number of turns out, with 2.5 being the average.

[Gmoney]

Always read the instructions . Try it. its not a hard adjustment. if it doesnt work turn it back.

[linp]

Hey Rodger/James, you guys wanna do Palomar this week, on a weekday? I've gotta take a video of your pipes heh... Popping is cool. And with earplugs, I barely notice it anymore.

[Gmoney]

how about friday? i dont feel like working friday.

[rb643]

Can't make it on Friday. Maybe sometime next week?

[Gmoney]

ok some time nextweek.

[linp]

Originally posted by Gmoney
how about friday? i dont feel like working friday.

I know it's kinda late. A couple friends and I will be at the Shell gas station off I-15 E Via Rancho Pkwy exit around 8:30AM for some fun runs at Palomar. It'd be great if you, or anyone, wants to come :D

(edit) Darn rain. No go.

[Gmoney]

:sad: I took a job for friday.

i also have to meet aussie to deliver my gsxr shock i sold him.:D

Or else i would be there. maybe next time.

[J0e]

I installed a set of Yosh bolt ons on my '03 SV1000S. I got the RS-3 race pipes...louder than hell.

Anyhoo, I noticed that the bike did run hot after then change, and backfired quite a bit when I rolled off the throttle and downshifted -- it made a pop pop pop sound.

Thinking that I was running too lean, I added a power commander (which I must say, was a little more difficult to install than I anticipated...) and changed the map to the Yosh map supplied on the website.

I can't see any real difference before and after...and I'm very disappointed...I rolled off the throttle and what do I hear? POP POP POP.

Any suggestions? Live with it?

[TIFOSO]

the popping has to do with the smog system sending air into the exhaust to improve emissions. I like that mine pops, but if I want to change it, I have to remove the smog stuff

[Bubba]

Here is a link to the SV1000 Portal FAQ. There has been a lot of discussion about this popping on the site and what can be done about it. The best fix is to disable the PAIR valve, which injects air into the exhaust on deceleration. I did this on my SV1000S, and the bike sounds a lot better.

SV1000 Portal FAQ (http://www.sv1000.zyns.com/forums/faq.php?)

[patriot_missile]

my bike does pop sometimes and louder depending on conditions but I know the thing runs lean the pipes are pretty blue and when you drill a hole about 2 inches wide and 1 inch tall in the baffle you are going to change the fuel/air mix. I do have a jet kit coming and I'm still thinking of a desnorkled air filter.

[03sv rider]

Question to all 03 SV650 owners with slip-ons: Do you experience a slight popping/ burble sound (not backfire) on decel aroud 2-3000rpm? I have recently installed a holeshot high-mount and can hear this occasionally when I get off the throttle and am curious if other pipes do the same. I have no mods done to the airbox, just the slip-on.

[Ikazuchi]

not enough backpressure....

It's what you get when you make the exhaust more free-flowing but not the intake so the bike runs a bit lean.

If you'd like to get rid of it, install a power commander and tune it. That'll get your fuel mixture up.

[poopoohead]

do the TRE mod and those "bubbling/popping" sounds will go away.

http://www.socalsvriders.org/forums/showthread.php?s=&postid=115748#post115748

[03sv rider]

Has anyone tried blocking the PAIR valve on their 03 650? I just completed it today and the bike has been cured. It now sounds wonderful on decel, no more pop boom bang!!!

[Beachbum]

I've been having this annoying popping sound when my bike (2000 sv650, 5300 mi) is idling. It seems to do it more when it's warmed up, and it continues even if I rev it up a little. I can't tell if it's doing it under load (while in gear), I can't feel or hear it anyway. It seems to be just a little puff of air coming out of the exhaust (stock) every couple of seconds. Just wondering if anyone has any insight, if I should be concerned. Any input would be appreciated.

[Chicago_SV]

Factory lean setting? The early SV's (98,99,2000,2001)are set lean for EPA standards
Some have reported very lean settings... mine was the same as you decscribe. I re-jet and added a pipe and it's night and day.
your 5k surge must be pretty bad if you have popping a idle.
also check the muffler connections at the head. they do get loose
and air can get in that way ...is this bike used? did they desnorkle the air filter on the stock pipe?

[Beachbum]

Yeah, I just bought it last week, I'm not familiar with how they are supposed to run as of now. Although as I recall, there is something there at 5000. I don't know about the desnorkel.

[Kurt'sSV]

Carbs might be out of sync. I got popping like that at idle when I synced it improperly. Once I did a better job at it, the popping stopped. (This was when I had a stock pipe and only minor rejetting to the carburetors)

[manxsv1]

Just put a full micron race system exhaust on my 2003 sv, and that pops and bangs , it dosent bother me in fact its music to my ears, just waiting to be pulled by the police though

[Beachbum]

Thanks for the suggestions, just glad it wasn't serious. I guess it was just weak spark, because my bike wouldn't start the other night and when I got the battery charged up, the popping quit. MIght be a regulator/rectifyer problem, but I'm going to see if the battery loses it's charge again.

[Chump]

I am running Dual Renegade Highs and have the same issue. Going to re-jet on my own minus the kit as well as applying a few of the other mods mentioned earlier. One question I do have regarding the desnorkel....I have heard that this is not something to do unless you are running a full exhaust, i.e. slip on's need not apply?? Any feedback on this? BTW, I'll post on the results of the carb mods asap. :squid:

[hehehemann]

I'm using a fully stock bike, it's a 2002 and all I've done is the shim move as per Johns site. I get this popping on deceleration and want to know how to get rid of it. My bike is a non-calif bike so I don't think I have the pair system as I couldn't see one.

Thanks

[SoyokazeSVS]

Hey folks,

I just rode in traffic for my second time yesterday and I began to notice something I hadn't before. More often then not, when I roll off the throttle at speeds greater than 35 mph I hear a weird pop. Its not too loud but it has me alittle concerned. Is this normal? Is it just the engine compression maybe?
Thanks.

[BioTek]

Well, I have a Cali model so expect the popping on mine to be due to the PAIR system, but I think it sounds bad ass and I kinda like it, especially when it kinda burbles in the Scorp pipe on decel around 4g's. :D

[SoyokazeSVS]

Well, the original owner did put a Scorpion exhaust on the bike so I guess that could be it then. Its not necessarily bad for the engine or anything is it?

[BioTek]

Originally posted by SoyokazeSVS
Well, the original owner did put a Scorpion exhaust on the bike so I guess that could be it then. Its not necessarily bad for the engine or anything is it?

I dont think it's bad news.

[J0e]

Originally posted by J0e
I installed a set of Yosh bolt ons on my '03 SV1000S. I got the RS-3 race pipes...louder than hell.

Anyhoo, I noticed that the bike did run hot after then change, and backfired quite a bit when I rolled off the throttle and downshifted -- it made a pop pop pop sound.

Thinking that I was running too lean, I added a power commander (which I must say, was a little more difficult to install than I anticipated...) and changed the map to the Yosh map supplied on the website.

I can't see any real difference before and after...and I'm very disappointed...I rolled off the throttle and what do I hear? POP POP POP.

Any suggestions? Live with it?


Two things have changed since I posted my original query:

1. I replaced the stock air filter with a K&N;

2. While I had the airbox open, I seated a cork in the PAIR intake hole (easy to install, easy to remove).

No more popping on decel. The K&N seems to have added a little more responsiveness to the throttle.

I've seen a half-dozen different recommendations about disabling/removing the PAIR system. This one seemed to me to be the least invasive.

[Eeyore]

You have to be careful about your cork. It could get sucked into the carb. The plastic and the cork probably expand at different rates and it could come loose.

Your better off taking the hose off the air box and putting a large ball bearing in it and reattaching it to look stock.

If you have a service done by a shop and they see your cork they could void the warrentee

[nefarious-az]

Originally posted by Eeyore
You have to be careful about your cork. It could get sucked into the carb. The plastic and the cork probably expand at different rates and it could come loose.

Your better off taking the hose off the air box and putting a large ball bearing in it and reattaching it to look stock.

If you have a service done by a shop and they see your cork they could void the warrentee



Yep it's VERY important to not get a corck stuck in the carb on a FI bike...hehe:D :eek:

[Herzuki]

I have the Yosh RS-3 full system w/K&N filter. I have slight pop on decel, but nothing major. The full system sounds so awesome, I don't even care about a little pop now & then, just makes the heads turn. ha!:D

[Im stupid]

do the TRE Mod and those pop-pop-pop sounds will be gone.....i had those sounds before the tre mod with my yosh rs3.....i took the tre mod back out and am too lazy to put it back in anyway so the popping on decel actually made its way into the norm and now i think it sounds cool....oh well i never really felt a diff with the TRE mod anyway:|

[Tillers_Rule]

Originally posted by Im stupid
do the TRE Mod and those pop-pop-pop sounds will be gone.....i had those sounds before the tre mod with my yosh rs3.....i took the tre mod back out and am too lazy to put it back in anyway so the popping on decel actually made its way into the norm and now i think it sounds cool....oh well i never really felt a diff with the TRE mod anyway:|


Hmmm, I was under the impresion that it was the PAIR valve block off that gets rid of the "pop pop" under deceleration, since that's when the PAIR valves open up.

The TRE works under acceleration only, which is'nt when the popping is occuring.

This is true on a TL anyway:D

[pAint]

i have a yosh tri oval and it pops too......and i love it! whats the big deal. popity pop popity pop!

[J0e]

I am considering replacing the natural cork with one of those new rubber ones (I pulled one out of a bottle of Shiraz from Yellow Tail). It seems like it would hold up a little better. I'm going to whittle it down to a point and insert it (sort of an SV suppository).

As to why you might want to do this...well for one, the popping will be eliminated; two, it's very simple; and three, pushing air into the exhaust to burn those unspent gases makes it hotter than hell -- evidenced by all those blue exhause manifolds I see out there. The idea is to keep that engine cool -- the PAIR valve actually increases the heat.

[Zombiesai]

I don't have a cali model..but i do have:

micron full exhaust
jet kit
TRE mod


and i still get the popping..
I think it's cool sort of, maybe it's just me..but i feel like im riding a high powered muscle machine, and im decelerating into turn 6....
but then I realise im about to hit that van and my popping is only cool to me.

[Novadesigns]

Yep its the PAIR mod that supposedly eliminates the popping not the TRE mod. The PAIR system injects cold air into the system to burn off excess fuel and keep the emissions cleaner. Remove or block it and you should have smoother decels.

[poopoohead]

well i never did teh pair mod just the tre and the popping goes away when i have the tre installed...popping comes back when the tre is taken out. so blah!:p

[matrix1171]

get rid of the pair system had the same problem with yosh trs tri oval 2 into 1 got rid of the pair system and the poppin went poof!!! (away) bike runs real strong

[SVSmiles]

FWIW to any 1st gen SV/S wrenchers, I was just noting this sort of small popping/backfire on deceleration after having performed a custom >Exhaust Project (http://www.socalsvriders.org/forums/showthread.php?s=&threadid=13679)< myself...

I thought it might be worth noting that thus far everything is the stock setup on a 49 state '02 SVS here other than the aforementioned exhaust change, which functions much like adding a Slipon (some reduced back pressure) where this (decel popping) issue is concern AND I have the TRE disabled.

I note this because it would seem several of the prior posts in this thread indicate the decel popping is fixed by disabling the Cal SV's PAIR system, which mine doesn't have and/or by disabling the TRE which I have done. This would seem to counter both of those previously noted fixes and makes things a bit :confused:

After taxes are a wrap here I'll start to look into a re-jet, filter and maybe tank riser changes to see how they might effect the decel pop here, but for now I thought the above was worth noting...