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EFI Sportster Motorcycle Talk (2007 and up) For 2007 and above Sportsters

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  #1  
Old 17th February 2016
sportsterking sportsterking is offline
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Sportster/Buell Model: XLH 1000
Sportster/Buell Year: 1975
Sportster/Buell Model #2: XL 1200N
Sportster/Buell Year #2: 2007
Reputation: 10
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Default White Smoke from Air Filter

Howdy all,

I've put on a mooneyes air filter (with breather bolts) on my EFI and have noticed recently that once it has warmed up you can really notice some white smoke/steam that smells like gas coming from the air filter. I never really used to be able to smell it so strongly until I made the change.

The performance hasn't really changed too much since I put it on but I am just wondering what the steam/ smoke means and whether it is of concern.

Thanks for the knowledge!
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  #2  
Old 17th February 2016
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schwede schwede is offline
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If you're talking about the bike in your stats. ..a 75 xlch 1000. ..you don't have an efi bike. ..try posting in the ironhead section...
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  #3  
Old 17th February 2016
Sweet Terry Smoove's Avatar
Sweet Terry Smoove Sweet Terry Smoove is offline
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Sportster/Buell Model: XL1200N
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What kind of exhaust are you running?
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  #4  
Old 18th February 2016
sportsterking sportsterking is offline
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Sportster/Buell Model: XLH 1000
Sportster/Buell Year: 1975
Sportster/Buell Model #2: XL 1200N
Sportster/Buell Year #2: 2007
Reputation: 10
sportsterking is an unknown quantity at this point
Default

Quote:
If you're talking about the bike in your stats. ..a 75 xlch 1000. ..you don't have an efi bike. ..try posting in the ironhead section...
This bike is a 2007 XL 1200N. I have two bikes (I know it is hard to imagine...) I didn't know how to add a second bike when I made my profile, and figured I will most likely be asking more questions about the ironhead, which is why it is in the profile. Please see the EFI bike in question.

Quote:
What kind of exhaust are you running?
The exhaust are the stock headers with Vance and Hines slip ons. It was mapped and tuned for this exhaust.
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  #5  
Old 18th February 2016
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Maybe one of your intake valves is letting the charge come back through. Do a leak down test and find out.
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  #6  
Old 18th February 2016
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I am not sure of the correct name, something like carb reversion, where overlap between the intake and exhaust valves and short intake runners cause air/fuel mixture to bounce off the intake valve as it closes and flow backwards and out the carb. I am not sure how much problems EFI bikes have had with this, or what to do about it.
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