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  #1  
Old 4th August 2009
neeko24's Avatar
neeko24 neeko24 is offline
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Default Burping sound in rear pipe?

My rear pipe has a hollow burping sound when idling. I dond notice it when riding but when I pull the clutch you can hear it and if you let the clutch out it tends to backfire. It seams to go away after I have been ridding for a while. Im new to this so I dont really know were to start. Any thoughts?
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  #2  
Old 4th August 2009
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Are you referring to an actual backfire out the pipe, an off-idle stumble, or carb pop?
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  #3  
Old 4th August 2009
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i'm thinking a carb pop.
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  #4  
Old 5th August 2009
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as it idles it stutters and has an uneven exhaust pattern unlike the front pipe that is smooth.
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  #5  
Old 5th August 2009
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Is this something new?
When did it start?
What was the last thing that was changed or worked on?
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  #6  
Old 5th August 2009
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started 3 days ago. after it started i changed the plugs and oil. nothing else done to it.
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  #7  
Old 7th August 2009
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Does it have good compression in both cylinders?
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Old 7th August 2009
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MY 1200 Sportster, 2000 vintage, has never idled smoothly and if it did, something would be bad wrong.

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  #9  
Old 7th August 2009
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Default

I think i know the noise and its fairly common

For lack of a better word it sounds like "PLOOP" its not a carb pop or exhaust backfire either

I have also heard the "Chirp" but only when the bike is cold

I cant tell you how i made them go away but they are.

The only thing i really do is torque the exhaust to 120 inch pounds using the screaming eagle gaskets.

Check the carb seals with propane
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  #10  
Old 9th August 2009
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I hear the same sound when I back off the enrichener after start up, but only when the bike is cold. Kind of a bloop sound. Never worried me before now. Is this normal? Should I be concerned? Maybe I should bring it to the dealer. Thanks for contributing to my neurosis. Now I'll never get to sleep.
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