slight backfire when letting off gas - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 10-08-2009, 08:54 PM   #1 (permalink)
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Default slight backfire when letting off gas

I bought my bike with used with cobra pipes on it. sometimes when I let off the gas it makes a slight backfire sound. nothing major just a little bit. is that normal or is there something that can fix that?
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Old 10-08-2009, 08:59 PM   #2 (permalink)
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Old 10-08-2009, 09:01 PM   #3 (permalink)
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some guy on another forum said to adjust my A/F mixture. but if its normal I would rather not mess with it! I dont know anything about it... Thanks a lot!
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Old 10-08-2009, 09:04 PM   #4 (permalink)
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Default Re: slight backfire when letting off gas

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Originally Posted by djdanko1
I bought my bike with used with cobra pipes on it. sometimes when I let off the gas it makes a slight backfire sound. nothing major just a little bit. is that normal or is there something that can fix that?
I used to get that when I had my idle set too low.
Try adjusting the idle up just a tad and see what happens.
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Old 10-08-2009, 09:20 PM   #5 (permalink)
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Default Re: slight backfire when letting off gas

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Originally Posted by djdanko1
is that normal or is there something that can fix that?
Yes and yes.

You would get better advice on how to "fix" it if we knew what year and model bike you have !!
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Old 10-08-2009, 10:15 PM   #6 (permalink)
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This is a little more info than you gave on the post about the air filter. I believe if you've got a little backfiring on your coast, you may be running a little lean. That K&N filter might have a little something to do with that. It'll flow more air, which requires a little more fuel. Most cases it's not enough to matter, but if yours was already a little on the lean side, and then you leaned it up a little more with the filter, could be time for a re-jetting. Was it like that before the filter change?
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Old 10-08-2009, 10:33 PM   #7 (permalink)
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Yes.. It does it the same amount with the new filter
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Old 10-09-2009, 11:11 AM   #8 (permalink)
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Oh wow ok I just responded to the other post about this (popcorn popper). Any way to merge the two topics?
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Old 10-10-2009, 10:23 PM   #9 (permalink)
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Default Re: slight backfire when letting off gas

Quote:
Originally Posted by djdanko1
I bought my bike with used with cobra pipes on it. sometimes when I let off the gas it makes a slight backfire sound. nothing major just a little bit. is that normal or is there something that can fix that?
The simple fix for this condition is to back out the carb pilot screws until the problem stops. Usually 1-2 turns. Howeve the pilot screws have a metal cover over them thanks to Uncle Sam, and these caps will need to be drilled or removed to access the adjustments screws.

You can drill these pilot screw caps with a 5/32 drill bit, then use a mini screw driver to adjust the screws. Some folks like to remove the caps after drilling them however, then they have to find something like silicone to cover up the pilot screws after adjusting them so they won't vibrate completely out while riding down the road. I preferred to keep my drilled caps in place to safely keep the pilot screws from ever falling out.
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