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[Ganderson]

Have had de-cel backfire since new....worse when it is cold....seems to get better after everything is warmed up good...not a real aggressive "pop" but sometimes annoying. Also having problems with it spitting/coughing when not warmed up....doesn't do it all the time but does it on a regular basis. The only thing that has been done is changed out the stock mufflers to BUB M23's....changed them out upon picking bike up from dealer new so I cannot say if it would be doing this with the stock exhaust. Dealer said I did not need a tune if only changing mufflers. Also, my selling dealer is "out of business" so I am trying to get some info before taking it to another dealer. Anyone having these same issues? Thanks

[Sledge]

Don't know what mods you had but my Ultra had decel pop until I got it tuned right.  Perhaps your map needs a tweak?  Also with mine I had to recalibrate the 02 sensors a couple times.  That was with a Daytona Twin Tech setup.  It was a pain to get set up right since I had straight through pipes in the beginning and not enough back pressure.  Once I installed a couple washers in the baffles and reset the map to let the tuner do it's job everything went great.  The path to nirvana was long my friend since I was a true noob to tuning back in 07.  (still am lol)

Some of this may apply to your problem but it's been a long time and technology has come a long way.  Don't know if recalibration of sensors is necessary anymore but I assume they can still get dirty and send wrong data to tuner.

[Sledge]

ps.  When you changed out your mufflers you also changed the amount of backpressure and therefore your tune is a bit off.  I know you can put on certain slip on mufflers like the new Rinehart 4 inchers (or at least that's what they say).

The Daytona Twin Tech designer told me that when I put the Rineharts on I would have to mod them with washers or I wouldn't have enough back pressure.  He was right on.  If you can stick a broom handle into the muffler and it doesn't hit anything, he said, they won't work out of the box with DTT tuner.  Probably same sort of situation with your change.  Change back pressure = problems you mentioned unless your tuner can compensate on the fly.

Hey I'm no expert, so I may be off in my conclusion.  Hopefully you'll get some more feedback from the helpful folks in this group.

[PAPA T]

It also could be nothing more than an exhaust leak at the gasket from them changing the pipes.

[Sledge]

Yep, Papa's got a point there.  You should be able to see some evidence of that where the leak is, right Papa?

[mrmagloo]

It also could be nothing more than an exhaust leak at the gasket from them changing the pipes.

When I was struggling with a pop after installing new pipes, a PCIII and getting a John Golden tune on my SED, he sent me a tip about how to install and properly torque exhaust gaskets and this quickly solved the problem.  This might not be your issue, but if you try everything else without success, this might be the problem.

[Midnight Rider]

When I was struggling with a pop after installing new pipes, a PCIII and getting a John Golden tune on my SED, he sent me a tip about how to install and properly torque exhaust gaskets and this quickly solved the problem.  This might not be your issue, but if you try everything else without success, this might be the problem.

So you're gonna' keep the tip all to yourself? 

To the original poster...if all they did was put slip on mufflers, they shouldn't have messed with the header pipe.  But, it wouldn't hurt to take a 1/2" open end wrench (you might have to find an old one and cut it in half to have room) and check the nuts on either side of the exhaust flange on both pipes where they come out of the heads.  Or get the dealer to check it.  The coughing/sputtering...something ain't right.

Sledge...not discounting what you're saying about the backpressure thing, but there are a lot of mufflers that are "straight thru"...actually, it's the baffle that is straight thru, but I digress...that don't backfire or sputter when the bike is tuned right.  The Fullsac system would be one prime example.  A little tiny bit of backfire on occasion would not be as much of a concern to me as the sputtering/coughing.

[mrmagloo]

So you're gonna' keep the tip all to yourself? 

I posted it on here somewhere, and I'm trying to find it.

Here it is:

http://www.cvoharley.com/smf/index.php?topic=38885.msg604674#msg604674

[Sledge]

That's a good link Magoo.  Filled in a bunch of blanks in my understanding of what causes decel popping.  Never had the sputtering problem though.

[mrmagloo]

That's a good link Magoo.  Filled in a bunch of blanks in my understanding of what causes decel popping.  Never had the sputtering problem though.

Yeah, John knows his stuff for sure.

[PAPA T]

Yep, Papa's got a point there.  You should be able to see some evidence of that where the leak is, right Papa?

I never saw any evidence of a leak on the outside. Just tightening the bolts stopped mine.

[Ganderson]

Thanks for all the responses guys....I only changed the mufflers and there is quite a bit of "wiggling" on the entire exhaust system in getting the stock ones off and the new ones on, so I will check the the bolts at the flanges to verify they are tight. The back pressure or lack of may be an issue as well and I may have to have it tuned.The de-cel pop is something I could live with but the spitting/coughing up a fur ball thing is my main concern....does it at the worst times....taking off at a light or just getting into a "lean" at a corner and it all but dies on it's face but catches at the last minute. Also, I see a lot of discussion on changing the pipes and getting rid of the catalyst....most seem to be looking at the FullSac X pipe....my question here is, what does this do to the warranty if you change all of this out? Thanks again for the responses....this is my first CVO and was hoping H-D took a little more "time"/"pride" in turning these out without problems but they appear to be typical assembly line produced machines....but absolutely great color schemes....mine is the 2011 Orange and Black.   

[gabhart]

I don't know if this is the same thing but on my '07 Ultra and my '11 SEUC when both were bone stock if I did not let them idle from a cold start for at least 30 seconds the bikes would sputter and barely want to take off. Once the '07 got a new exhaust and tune it never did it again.

I have not yet completed my exhaust work on my '11. She almost bucked me off the other morning because I didn't let her warm up! Adding 3.5" Rinehart's to the stock head pipe did not help at all. As a matter of fact these slip-on's actually are causing a slight decel pop.

[Sledge]

Adding 3.5" Rinehart's to the stock head pipe did not help at all. As a matter of fact these slip-on's actually are causing a slight decel pop.

I had Rineharts and my decel pop did not go away till I reset the map and let the tuner readjust.  I also had a problem where the bike would just idle too low and die within a few yards of a stop.  I think the sputtering you're talking about is what was happening.  After the tune and washer install in the baffles it idled great and no more decel pop.  I thought the new Rinehart 4" were the only ones that you can just put on with no map changes.  The 3.5's might require a map edit.

[gabhart]

I had Rineharts and my decel pop did not go away till I reset the map and let the tuner readjust.  I also had a problem where the bike would just idle too low and die within a few yards of a stop.  I think the sputtering you're talking about is what was happening.  After the tune and washer install in the baffles it idled great and no more decel pop.  I thought the new Rinehart 4" were the only ones that you can just put on with no map changes.  The 3.5's might require a map edit.

I have not bothered with the map for the slip-on's based on Rinehart's website that specifically states: **Do not adjust stock ECU settings with Rinehart slip-ons on 2009-2011 H-D Touring models with stock head pipes. This is temporary anyway since I have a Fullsac X-Pipe sitting in my garage and I will be ordering a TTS Mastertune today.