Backfiring
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Tourer
Joined: Jan 2013
Posts: 290
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From: Wisconsin
Backfiring
I have a 2001 Electra glide (carbed), it has started to backfire when I downshift and start to slow down. Is this what is considered decal popping? Also I have noticed the exhaust pipe changing color at the point where the slip on meets the header pipe...a brown/blue color.
What could be the cause?
What could be the cause?
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,281
Likes: 1,139
From: southeast PA
Backfiring can happen if you have a leak at the intake or exhaust. It's usually on the intake side, but can be the exhaust. Where you see discoloration may mean you have a leak at that joint.
As Scrambler said, it might be a tuning issue with the carb.
As Scrambler said, it might be a tuning issue with the carb.
Seasoned HDF Member
Joined: Jun 2010
Posts: 9,332
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From: Upstate New York
Have you made any other changes lately that would affect the mixture? Carburetors don't change their own jets. If you've made no other changes (new pipes, air cleaner, etc.), I'd suspect a manifold leak.
If your idle mixture is borderline lean to begin with, the onset of colder weather can aggravate deceleration popping. You might try going up one size on the slow jet and see if it helps.
If your idle mixture is borderline lean to begin with, the onset of colder weather can aggravate deceleration popping. You might try going up one size on the slow jet and see if it helps.
Club Member
Joined: May 2007
Posts: 145,895
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From: 40 miles Northeast of Indy..
Only time I had decell Backfire was when I had a muffler leaking and sucking air at the muff to header connection... redid the muffs to get a good seal and back firing gone..
Decell popping is not the same as Decell Backfiring...
Decell popping is not the same as Decell Backfiring...
Does sound like something has changed. I believe the browning to the pipe is being caused by additional heat. Maybe the carb isn't getting the fuel it needs so it's lean, causing more heat.
To clear the discoloration try this stuff. It's what I've used and had great results.
To clear the discoloration try this stuff. It's what I've used and had great results.
Seasoned HDF Member
Joined: Aug 2007
Posts: 21,722
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From: Driftless Area
Assuming it's a stock CV carb, try a 180 main jet.
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Tourer
Joined: Jan 2013
Posts: 290
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From: Wisconsin
Thanks guys. As far as I know everything is stock on the bike. I just got it this summer and haven't had any issues with backfiring until the last couple weeks. I check out the connection/seal at intake and exhaist first.
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