decel pop normal?
Thread Starter
|
Road Master
Joined: Sep 2010
Posts: 797
Likes: 0
decel pop normal?
I have a 2009 cross bones I bought used in November with 8500 miles. I had a complete inspection including compression test done when I bought it and all was good. It has a velocity stack and custom cut pipes that are loud as hell. I never ran this set up before so I was expecting the loud noise, never thought much of it until I rode with a buddy who says decel POP means its running rich. It was dyno tuned by previous owner and has a sert on it. How worried should I be?
Ultimate HDF Member
Joined: Nov 2007
Posts: 6,975
Likes: 12
From: NJ
From what I've gathered on here, running a little rich is not a bad thing. As long as you're not shooting flames and ruining plugs, a rich mix will run cooler and last longer. It's running too lean that ya gotta worry about. They say "lean is mean, but rich will run forever". As for the decel pop, not sure if that's caused by lean or rich, someone else will chime in on that I'm sure. Just out of curiosity, what's your gas mileage?
Seasoned HDF Member
Joined: Mar 2012
Posts: 100,455
Likes: 19,811
From: Centennial, CO
Good find Jimmers! The OP needs a baffle at least to get some control of the exhaust pulses. Guys I've talked about with about this look at me like I've grown 2 heads when I tell them they are lean on decel. I only found this out thru experience of my own and a little research. Added Thunder Torque inserts and the pop and backfire too went away. As a bonus, it really woke up my bike.
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,315
Likes: 2,453
From: Eastern NE
Popping indicates something's not mixing right...could be exhaust leak, or intake leak. Rich tune's another avenue. Check SERT map & maybe reduce fuel a tad between cruise & decel transition point.
Trending Topics
Cruiser
Joined: Jul 2006
Posts: 246
Likes: 2
From:
A little decel popping isn't a big deal. I can richen up my PCV and get it popping pretty good. I like just a little bit, nothing loud or nasty sounding. 30 mpg does sound like you're maybe running too rich. Time for a little tuning I think. Lean it out a bit. A dyno run will let you know what you need to change.
Jake
Jake
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
Jason Momoa Is Turning Classic Harleys Into PHEVs
Verdad Gallardo
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Verdad Gallardo
6 Weirdest Harley-Davidsons Ever Sold to the Public
Verdad Gallardo
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Seasoned HDF Member
Joined: Aug 2010
Posts: 5,173
Likes: 177
From: East Coast