Backfire
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Tourer
Joined: Apr 2011
Posts: 447
Likes: 55
From: Seattle area
Backfire
Today for the first time, I noticed backfire. Happens while shifting up between gears.
Am wondering if this could be caused by an exhaust leak.
Also wonder if I could need new sparkplugs. Have 17,000 miles or original plugs.
Any other thoughts?
Bike is a 2008, 1200 custom, with screamin eagle mufflers, but no other mods.
Thanks,
Balloo
Am wondering if this could be caused by an exhaust leak.
Also wonder if I could need new sparkplugs. Have 17,000 miles or original plugs.
Any other thoughts?
Bike is a 2008, 1200 custom, with screamin eagle mufflers, but no other mods.
Thanks,
Balloo
Intermediate
Joined: Jun 2012
Posts: 34
Likes: 0
From: Texas DFW
Occasionally I will get the popping in my exhaust on my 08 custom with cycle shack mufflers. It seems pretty random and I have not yet figured out exactly what I am doing that causes it. That said it is more likely to happen when its cold, but still occasionally when fully warmed up i'll get a pop when decelerating or when i let off to change gears. I don't think its anything to worry over. Plugs may be in order at 17k miles, but that really depends on their condition, and they are cheap so I would go for it.
Stellar HDF Member
Joined: Oct 2010
Posts: 2,599
Likes: 183
From: east texas
first define "backfire"
If it pops out of the carb/EFI/aircleaner is a backfire .
If it pops out of the exhaust it is "stackfire" ,or exhaust pop.
lean cause's backfire ..i/e coughs/jerks pops out of the aircleaner.
can be a incorrect setting of acclerator pump,(or virtual fuel pump in the EFI) or CV boot leak.
also a aircleaner problem..(leaking) not enough restriction.
popping out of the exhaust can be caused by lean condition , carb/efi settings, or exhaust leak.
too low idle
wrong needle in slide /efi not calibrated correctly
pilot jet too small
straight through exhaust, (without proper adjustment to the intake system ) sometimes backpressure is good
these are just a few things , there are others ..
.
OK you just asked "what time is it ?"
Now you have to know how the "watch works " ..
If it pops out of the carb/EFI/aircleaner is a backfire .
If it pops out of the exhaust it is "stackfire" ,or exhaust pop.
lean cause's backfire ..i/e coughs/jerks pops out of the aircleaner.
can be a incorrect setting of acclerator pump,(or virtual fuel pump in the EFI) or CV boot leak.
also a aircleaner problem..(leaking) not enough restriction.
popping out of the exhaust can be caused by lean condition , carb/efi settings, or exhaust leak.
too low idle
wrong needle in slide /efi not calibrated correctly
pilot jet too small
straight through exhaust, (without proper adjustment to the intake system ) sometimes backpressure is good
these are just a few things , there are others ..
.
OK you just asked "what time is it ?"
Now you have to know how the "watch works " ..
Last edited by heybaylor; Oct 7, 2012 at 09:06 AM.
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