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23rd May 2012
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JESTER MAFIA
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Join Date: Feb 2006
Location: Indian Territory
Posts: 9,113 Sportster/Buell Model: NRHS 1250-R Sportster/Buell Year: 2005
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Quote:
Originally Posted by Lenster
...I'm not sure why a loose fuel line would give me lean readings. Anyone have any ideas?
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Maybe a bit of air getting in???
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A Member of The Cell
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23rd May 2012
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Senior Chief Harley Engineer
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Join Date: Apr 2005
Location: Thompsons Corner, MD
Posts: 1,042 Sportster/Buell Model: 883 Flat Track Racer Sportster/Buell Year: 2002 Sportster/Buell Model #2: RIP 1200S Sportster/Buell Year #2: 1999
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Sure sounds weird to me unless more fuel was pouring onto the ground then into your carb. Almost makes you question the O2 sensor or the maybe something else occured
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1999 XL1200S - SE slips ons, SE ignition 5500, 6800 & 7500 RPM (I got worried about the ignition getting discontinued so I bought what I could)
Link to thread on "Harley Racing" events across the country: http://xlforum.net/vbportal/forums/showthread.php?t=53470
These events include Hillclimbing, Flat Track Racing, Ice racing, Drag Racing, etc.. They are all sports dominated by Harley Davidsons. They are always located in scenic areas and are great weekend rides. The above link allows XLforum users to coordinate riding to these events together.
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23rd May 2012
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JESTER Mafia-Hooligan Div
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Join Date: Sep 2005
Location: West Central Indiana
Posts: 9,441 Sportster/Buell Model: 1200 R Sportster/Buell Year: 2005
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Quote:
Originally Posted by Rico 05R
Maybe a bit of air getting in???
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That's the only thing that comes to my mind!  Seems weird though! 
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Stuff: YES
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23rd May 2012
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JESTER MAFIA
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Join Date: Feb 2006
Location: Indian Territory
Posts: 9,113 Sportster/Buell Model: NRHS 1250-R Sportster/Buell Year: 2005
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Quote:
Originally Posted by BWP 5p
That's the only thing that comes to my mind! Seems weird though! |
I agree...after I wrote that, I thought that can't be right. But it was the only thing I could think of that might explain that radical of a change in the AFR. |
24th May 2012
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Senior Master Custom Bike Builder
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Join Date: Mar 2007
Location: Calgary, AB, Canada
Posts: 4,296 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006
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It is definitely weird. There was no fuel leaking out onto the ground.
The only theory that I have come up with so far is that the (air) leak some how affected the fuel level in the float bowl, and I had to over jet to compensate.
I imagine I'll pick up a few HP with better jetting (and no leaks).
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Getting through the Break-In Miles Sucks!
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24th May 2012
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JESTER MAFIA
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Join Date: Feb 2006
Location: Indian Territory
Posts: 9,113 Sportster/Buell Model: NRHS 1250-R Sportster/Buell Year: 2005
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I'm sending you another map to look at. After riding the last one I sent you for a while...don't bother with it.
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24th May 2012
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Senior Chief Master Mechanic
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Join Date: May 2011
Location: spencerville
Posts: 974 Sportster/Buell Model: sportster Sportster/Buell Year: 2003 Sportster/Buell Model #2: 1200 xl sportster custom Sportster/Buell Year #2: 03 Other Motorcycle Model: 1200 low sportster Other Motorcycle Year: 06
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that makes like no sense and you would see that much of a fuel leak out, but on the other hand it could pull more fuel now instead of air have you driven the bike since you have fixed this i wonder if you have a intake leak when its hot and when its cold it seals back up some what .that would give you a wearied reading.
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24th May 2012
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XL FORUM TEAM MEMBER
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Join Date: May 2011
Location: Irwin, Pennsylvania
Posts: 4,537 Sportster/Buell Model: Hammer 1250 Hugger Sportster/Buell Year: 1997
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Quote:
Originally Posted by Bob s hog
that makes like no sense and you would see that much of a fuel leak out, but on the other hand it could pull more fuel now instead of air have you driven the bike since you have fixed this i wonder if you have a intake leak when its hot and when its cold it seals back up some what .that would give you a wearied reading.
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Can the intake vacume create enough internal carburator negative pressure to actually cause aeration fof the fuel in the bowl? If it can, then the fuel being fed through the jets would also be a bit leaner.
Just trying to think it through?
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Hammer Performance 1250 kit w/ 30* Reverse Dome Pistons, Smash Level 883 Head Treatment w/ 1.770 Intake/ 1.615 Exhaust & PAC Alloy Beehive Spring Pack, Impact 560 Lift Cams, Billet Aluminum Intake Manifold, Air Hammer Naked Billet Air Cleaner w/ 3" K&N Element, Mikuni HSR 42, Dynatek 2000P Ignition, Basanni Road Rage 2-1 Exhaust with a 4" Performance Machine Billet Tip.
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24th May 2012
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Senior Chief Master Mechanic
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Join Date: May 2011
Location: spencerville
Posts: 974 Sportster/Buell Model: sportster Sportster/Buell Year: 2003 Sportster/Buell Model #2: 1200 xl sportster custom Sportster/Buell Year #2: 03 Other Motorcycle Model: 1200 low sportster Other Motorcycle Year: 06
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yes it can and know that he has a good seal i think it will draw more fuel kinda like a venturi effect
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24th May 2012
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Senior Master Custom Bike Builder
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Join Date: Mar 2007
Location: Calgary, AB, Canada
Posts: 4,296 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006
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Quote:
Originally Posted by Rico 05R
I'm sending you another map to look at. After riding the last one I sent you for a while...don't bother with it.
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Thanks brother! Always up for trying new maps.
Quote:
Originally Posted by Bob s hog
that makes like no sense and you would see that much of a fuel leak out, but on the other hand it could pull more fuel now instead of air have you driven the bike since you have fixed this i wonder if you have a intake leak when its hot and when its cold it seals back up some what .that would give you a wearied reading.
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As soon as I fixed the loose fitting my AFR became WAY rich. I have ridden it quite a bit after the fix and its always rich so I'm assuming there isn't an intake leak. I also think you're onto something about it being able to draw more fuel, maybe because the float bowl was over vented with the leak, the atmospheric pressure couldn't push the proper amount of fuel. |
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