Popping & Backfiring ?
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Cruiser
Joined: Apr 2006
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Popping & Backfiring ?
Took my first ride today since my dealer Installed my Rinehart Slip On's, sert, and A/C upgrade on my 07 RKC. It seems to run good except I am getting some popping and minor backfiring on decel and downshifting. I am going to call them tomorrow but does anyone know if this is normal ? It is not real bad but it does happen. I think popping is a better description then backfiring. The pipes sound great, even the occasional popping sounds kind of cool, I just don't want anything damaged. How much back popping is to much ? Thanks !....CJ
Outstanding HDF Member
Joined: Oct 2006
Posts: 2,183
Likes: 1
From: Lenexa, KS (KC)
RE: Popping & Backfiring ?
Like Texas says, you might have a loose exhaust flange.
I was having quite a bit of popping on decel, probably like you, but decided to just upgrade my exhaust as part of my winter improvement program (sounds official, huh). Ireplaced my exhaust with Rinehart TD's and when I went to remove the old exhaust headers, I could just about remove them without a wrench! Couldn't believe it. That was probably the source of my popping problem. My new exhaust doesn't do it, but I also torqued the exhaust flange per specs.
May not be your problem, but easy enough to check.
I was having quite a bit of popping on decel, probably like you, but decided to just upgrade my exhaust as part of my winter improvement program (sounds official, huh). Ireplaced my exhaust with Rinehart TD's and when I went to remove the old exhaust headers, I could just about remove them without a wrench! Couldn't believe it. That was probably the source of my popping problem. My new exhaust doesn't do it, but I also torqued the exhaust flange per specs.
May not be your problem, but easy enough to check.
Outstanding HDF Member
Joined: Feb 2007
Posts: 3,417
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From: Salem, OR
RE: Popping & Backfiring ?
Sounds like you should have your dealer re-tune your bike. Explain your problem to them and get it tuned properly. Since you put the SERT on it should run perfectly.
Road Captain
Joined: Apr 2006
Posts: 601
Likes: 0
From: Ingleside Texas
RE: Popping & Backfiring ?
The popping or back firing is caused by the crossover pipe, you need to go with true duels or block the crossover,,,,this usually happens to most H-D's when the pipes are upgraded and or A/C system or some type of fuel upgrade is performed. The rear cylinder does not breathe as well as the front and in turn has a harder time exhausting the air fuel mixture leaving raw fuel in the cylinder, it is hard to tune a bike properly with this condition,,in stock form there is no real problem because of the lean condition of the factory settings.....
Club Member
Joined: Sep 2006
Posts: 574
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From: Woodland Twp, NJ
RE: Popping & Backfiring ?
My 2000 injected RKC pops, too. it's got SE pipes but the factory air cleaner soI don't think anything else was done. The inside of the pipes are black, too. i wonder if it's a little rich?
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Joined: Feb 2006
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From:
RE: Popping & Backfiring ?
Poping and backfire is not caused by your pipes, its caused by lean conditions at certain throttle settings, You did have the SERT tuned in buy a dnyo at the dealership? Or did they just add the SERT and a download map from the cd? You should know since a good dyno tune will run you about 300.00. If you did not, then there is your problem. SERT maps are mostly set up for harley parts and rhineharts are very free flowing pipes, more so than any harley sells so they remove the exhaust faster and this will cause it to pop and backfire on decell. Get it dyno tuned. If it was, then the bozo that did it, needs to redo it for you.
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Cruiser
Joined: May 2006
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RE: Popping & Backfiring ?
Hmmm, Just got mine back from the shop, had the 2500 service and a re-Dyno'd. Before the 2nd retune, it got very very hot, would have high ping (pre-detonation ping, like using low grade gas), and had a lot of down pressure popping when coming to a stop thru the Rhineharts. My heating problem was so bad, it turned the end cap red. At night,friends would say flames actually came out of the right pipe when i would downshift.. hehe, looked kewl thou 
After the dyno, the heat does seem to have been reduced, the high ping still occurs but nothing like it was, and the popping in the pipes has been reduced but still there.
This makes the 2nd dyno they have put on the bike. Are you suggesting the popping sound is related to improper tuning? Should I call them and take it back for another dyno?
The one thing that I kept getting from the dealer was they could not figure out why the right side pipe was getting as hot as it was. I mean, it was realllly hot. When I would check the temp at the pipe itself.. at the end pipe, it was 450+ degrees.. AT THE ENDCAP!...
After the dyno, the heat does seem to have been reduced, the high ping still occurs but nothing like it was, and the popping in the pipes has been reduced but still there.
This makes the 2nd dyno they have put on the bike. Are you suggesting the popping sound is related to improper tuning? Should I call them and take it back for another dyno?
The one thing that I kept getting from the dealer was they could not figure out why the right side pipe was getting as hot as it was. I mean, it was realllly hot. When I would check the temp at the pipe itself.. at the end pipe, it was 450+ degrees.. AT THE ENDCAP!...
Elite HDF Member
Joined: Feb 2006
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From:
RE: Popping & Backfiring ?
ORIGINAL: RainMaker
Hmmm, Just got mine back from the shop, had the 2500 service and a re-Dyno'd. Before the 2nd retune, it got very very hot, would have high ping (pre-detonation ping, like using low grade gas), and had a lot of down pressure popping when coming to a stop thru the Rhineharts. My heating problem was so bad, it turned the end cap red. At night,friends would say flames actually came out of the right pipe when i would downshift.. hehe, looked kewl thou
After the dyno, the heat does seem to have been reduced, the high ping still occurs but nothing like it was, and the popping in the pipes has been reduced but still there.
This makes the 2nd dyno they have put on the bike. Are you suggesting the popping sound is related to improper tuning? Should I call them and take it back for another dyno?
The one thing that I kept getting from the dealer was they could not figure out why the right side pipe was getting as hot as it was. I mean, it was realllly hot. When I would check the temp at the pipe itself.. at the end pipe, it was 450+ degrees.. AT THE ENDCAP!...
Hmmm, Just got mine back from the shop, had the 2500 service and a re-Dyno'd. Before the 2nd retune, it got very very hot, would have high ping (pre-detonation ping, like using low grade gas), and had a lot of down pressure popping when coming to a stop thru the Rhineharts. My heating problem was so bad, it turned the end cap red. At night,friends would say flames actually came out of the right pipe when i would downshift.. hehe, looked kewl thou
After the dyno, the heat does seem to have been reduced, the high ping still occurs but nothing like it was, and the popping in the pipes has been reduced but still there.
This makes the 2nd dyno they have put on the bike. Are you suggesting the popping sound is related to improper tuning? Should I call them and take it back for another dyno?
The one thing that I kept getting from the dealer was they could not figure out why the right side pipe was getting as hot as it was. I mean, it was realllly hot. When I would check the temp at the pipe itself.. at the end pipe, it was 450+ degrees.. AT THE ENDCAP!...