Rush Slip-ons decel popping
Tourer
Joined: Aug 2010
Posts: 458
Likes: 0
From: NC
I know there are a ton of posts on this issue but I just got an answer from Rush that mayt be helpful to others. I bought and installed 1.75" baloney cut Rush slip ons for my brand new 2011 Fat Boy. Install was pretty easy except for the muffler support fasteners which are just hard to access but doable with some patience and banged up knuckles. First run out I got some annoying popping on decel and when disengaging the clutch.
I emailed Rush tech support and they came right back with this...
"Decel popping with the 1.75” baffles is most commonly caused by an exhaust leak. RUSH Exhaust is manufactured using 16-gauge steel, which is much thicker than stock and requires 65 ft.lb. of torque. To check for an exhaust leak, here is an east method. Start the bike and while it is idling, light a wooden match and blow it out. Immediately place it close to the connection of the muffler and the head pipe. If the smoke sucks inside the exhaust, you have a leak. It is best to do this in a garage where there is not any wind. You may also find it easier to use a cigar, cigarette, incense stick, etc."
Since the softail service manual calls for 38-43 ft-lbs on the muffler clamps, I was way undertightened.
Hope this helps
I emailed Rush tech support and they came right back with this...
"Decel popping with the 1.75” baffles is most commonly caused by an exhaust leak. RUSH Exhaust is manufactured using 16-gauge steel, which is much thicker than stock and requires 65 ft.lb. of torque. To check for an exhaust leak, here is an east method. Start the bike and while it is idling, light a wooden match and blow it out. Immediately place it close to the connection of the muffler and the head pipe. If the smoke sucks inside the exhaust, you have a leak. It is best to do this in a garage where there is not any wind. You may also find it easier to use a cigar, cigarette, incense stick, etc."
Since the softail service manual calls for 38-43 ft-lbs on the muffler clamps, I was way undertightened.
Hope this helps
A flashlight..a wooden match...and a torque wrench.
Damn...thats exotic!
I have the 2011 service manual-Page 4-38-Figure 4-58.
Are you talking about part number 21?
Where do you get the clamps?....(Dealer is about an hours drive away).....just in case Mr. Murphy tags along?
Thanks for the help in advance!
Last edited by MJ-13000; Jun 8, 2011 at 08:12 AM. Reason: ask another question
Tourer
Joined: Aug 2010
Posts: 458
Likes: 0
From: NC
I was able to tighten the bottom one "more than a few turns"!
Took her out for a few hours today..rolling off throttle completely as well practically eliminated the decel pop.
Not as bad as it was!
Much thanks for the info!
Took her out for a few hours today..rolling off throttle completely as well practically eliminated the decel pop.
Not as bad as it was!
Much thanks for the info!
Advanced
Joined: Oct 2011
Posts: 89
Likes: 1
From: Boardman, Ohio
Interesting thread. I'm new to the forum and this is an issue I've had with my 2011 CVO convertible.
I had one tech tell me it needs a tuner and another tech (same dealership) tell me it's not necessary.
Time to get the torque wrench out and settle this!!
Thanks guys.
I had one tech tell me it needs a tuner and another tech (same dealership) tell me it's not necessary.
Time to get the torque wrench out and settle this!!
Thanks guys.
Outstanding HDF Member
Joined: Oct 2006
Posts: 2,179
Likes: 1
From: Southern California
A lean mixture doesn't cause popping on deceleration, but unburned fuel coming from the engine and mixing with more air coming up through the exhaust will by acting a little like an after-burner. If anything, popping on deceleration indicates a slightly rich mixture. I can see how an exhaust leak may cause some popping, but, even if all leaks were sealed off, popping can still occur if the air/fuel mix isn't correct. Bringing in more air on the front end may reduce or eliminate popping by burning excess fuel (making it leaner) before reaching the headers.
But, what do I know....I'm just a banjo playin' inbred!
But, what do I know....I'm just a banjo playin' inbred!
So, back to the garage....reduce the "value" to 16....go for a ride...no more smell and still no popping.....Back to the garage....reduce to 14...same thing...no smell, no popping....Garage again...reduce the "values" to 12...went for a ride....no smell but the popping returned....back to the garage....Increase the "value" to 13.....ride it...no smell, no popping, gurgles is all, and runs like a frightened rabbit. I average 38-40 MPG....Highway travel is 42+...
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