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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 2nd November 2011
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Default Exhaust Backfire issue

I have a 98 XL 1200 which just started backfiring thru the exhaust between shifts and just reving it in neutral when the rpms go down. Tried carb and timing adjmnts but it did nothing. It always did backfire a little upon deceleration, but not the between shift thing or just reving it in neutral. Plugs look real clean and not really brown . Also when I pull out the choke knob and rev it the backfiring will stop, but I could not adjust it richer with the air/fuel screw as it really did not change anything. The bike starts and runs great otherwise. Any ideas?
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  #2  
Old 2nd November 2011
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Check the exhaust gaskets and intake seals. While the bike is running spray some wd-40 near the intake seals on the heads and if the rpms change, you have a leak. I don't remember how to check the exhaust gaskets but those can cause the bike to run abit lean. Is your bike stock?
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Old 2nd November 2011
AsSeenOnTV AsSeenOnTV is offline
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Your bike is probably lean.

http://www.sportster.org/tech/lee-c-...-instructions/
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  #4  
Old 2nd November 2011
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I bought bike used.Has screamin eagle pipes and a 170 jet in carb. Did the water spray thing on the intakes , but have not checked the exhaust gaskets etc for leaks.
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  #5  
Old 2nd November 2011
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Default

Quote:
Originally Posted by Pringles21 View Post
Check the exhaust gaskets and intake seals. While the bike is running spray some wd-40 near the intake seals on the heads and if the rpms change, you have a leak. I don't remember how to check the exhaust gaskets but those can cause the bike to run abit lean. Is your bike stock?
Bike is stock but do have screamin eagle pipes on it.
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  #6  
Old 2nd November 2011
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Please check Shelle's reference thread and you will be shown the "light". Now let the bonding begin.
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  #7  
Old 2nd November 2011
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Where do I finf Shelle's thread?
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Old 2nd November 2011
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Quote:
Originally Posted by chinkr View Post
Where do I finf Shelle's thread?

http://www.sportster.org/tech/lee-c-...-instructions/
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Old 3rd November 2011
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Quote:
Originally Posted by jharback View Post
Jim: Thanks for that, dumb me should realize that not everybody on the Forum knows who Shelle is, thanks again.
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Old 3rd November 2011
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Quote:
Originally Posted by chinkr View Post
Where do I finf Shelle's thread?
Scroll up to post number 3, I fixed it for ya
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