New slip on backfire more. - Harley Davidson Forums

Exhaust System Topics New and old exhaust system discussions. Fitment issues to sound bites and suggestions. Post them here.

New slip on backfire more.

Thread Tools Search this Thread
Old 08-02-2017, 12:38 AM
Brent09 Brent09 is offline
New Member
Thread Starter
Join Date: Jun 2015
Location: Canada
Posts: 13
Thanked 0 Times in 0 Posts
Default New slip on backfire more.

09 Ultra classic. I bought this bike a few years ago and wasn't happy with the stock slip on sound. I bought some slip on on- the sound much better! My question is, now it pops n farts when I'm slowing down, never did that before??
Didn't use any sealer etc...juse tightened up the Clamp? Did I forget to do something?
Reply With Quote
Old 08-02-2017, 01:59 AM
TomCop's Avatar
TomCop TomCop is offline
One Of The Regulars
Join Date: Jul 2017
Location: UAE
Posts: 201
Thanked 38 Times in 35 Posts

As your exhaust gasses exit faster and they have still a very high temp, this makes them react with the surrounding O2 in the air.
You need to increase your decel setting to inject a bit more fuel. This will prevent the exhaust gasses from "popping"
Reply With Quote
Old 08-02-2017, 05:54 AM
grbrown's Avatar
grbrown grbrown is online now
Club Member
Join Date: Jun 2007
Location: Bedford UK
Posts: 38,029
Thanked 1,040 Times in 964 Posts

It's common folk-lore that we can change certain things like mufflers, without retuning the bike to compensate. That is not always the case, as you may have found. By all means check that you don't have any leaks, either in the induction side or exhaust, otherwise look to retune your bike. You may be pleasantly surprised how much better it can ride!
Reply With Quote
Old 08-02-2017, 11:35 AM
dfwhockey17 dfwhockey17 is offline
Road Warrior
Join Date: May 2014
Location: Fort Worth, TX
Posts: 1,961
Thanked 139 Times in 133 Posts

Get a tuner and tune the bike...
Reply With Quote
Old 02-13-2018, 09:38 AM
Idahokid's Avatar
Idahokid Idahokid is online now
Road Captain
Join Date: Apr 2014
Location: Post Falls,Idaho
Posts: 520
Thanked 24 Times in 22 Posts

My bike did the same thing now that the exhaust is open and free flowing.The FP3 tuner got rid of my decel popping and gave it a bump in Power.
Reply With Quote
Old 02-13-2018, 10:13 AM
Vec's Avatar
Vec Vec is offline
One Of The Regulars
Join Date: Jun 2017
Location: Texas Hill Country
Posts: 230
Thanked 41 Times in 27 Posts

it doesnt hurt anything, I like the popping and burping because it scares sockermoms in minivans and little kids.
Reply With Quote
The Following User Says Thank You to Vec For This Useful Post:
Idahokid (02-18-2018)
Old 02-13-2018, 10:22 AM
bustert bustert is offline
Road Captain
Join Date: Aug 2008
Posts: 603
Thanked 65 Times in 64 Posts

yep, the lean out or unburned fuel collects in the exh till there is enough to ignite. so that tells me hd does not cut fuel off on decel till under a certain rpm, which if it did, the problem would not be there.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Slip On Exhaust for 09 Road King Kingface Want To Buy Motorcycles/Parts/Accessories 7 01-06-2018 12:47 AM
'09 FLHTCU exhaust puzzle pitarobb Touring Models 3 08-14-2017 11:48 AM
4" Cobra slip-ons, sound same as stock! DCRANER Exhaust System Topics 4 05-18-2017 01:31 AM
Weak Rineharts pshaw09 Milwaukee Eight (M8) 9 11-06-2016 11:10 PM
Slip-ons for 09 RKC Fine09 Touring Models 8 10-05-2016 02:03 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 09:35 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: