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26th July 2008
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Biker
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Join Date: Jul 2007
Posts: 98 Sportster/Buell Model: XL1200R Sportster/Buell Year: 2004 Sportster/Buell Model #2: XL1100 Sportster/Buell Year #2: 1986
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new K&N filter kit
After reading through the entire SE ac filter thread (38 pages!) I went and checked out K&N's web site for their filter kit. I notice they say 'no jetting or fuel modifications needed' I would take this to mean no significant HP gains as major increase in flow would require adjustments to avoid a lean mixture.
Is this correct?
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26th July 2008
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Flat Track Champion
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Join Date: May 2008
Location: southern indiana
Posts: 621 Sportster/Buell Model: xl1200c Sportster/Buell Year: 2001 Sportster/Buell Model #2: xlch900 sportster Sportster/Buell Year #2: 1966
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mine ran like crap after adding just the k/n filter kit but after a small rejet it runs much much better
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27th July 2008
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Biker
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Join Date: Jul 2007
Posts: 98 Sportster/Buell Model: XL1200R Sportster/Buell Year: 2004 Sportster/Buell Model #2: XL1100 Sportster/Buell Year #2: 1986
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Quote:
Originally Posted by sporty01
mine ran like crap after adding just the k/n filter kit but after a small rejet it runs much much better
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I actually find that encouraging. What change did you make? |
27th July 2008
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XL FORUM LIFE MEMBER
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Join Date: Feb 2007
Location: Pittsburgh, PA
Posts: 13,156 Sportster/Buell Model: XL50 0596 Black Sportster/Buell Year: 2007 Other Motorcycle Model: E-Glide Other Motorcycle Year: 2003
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Quote:
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I would take this to mean no significant HP gains
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On my 2007 1200 I did the Gronk mod to the mufflers, opened up the AC backing plate and installed the K&N AC. When I had a baseline pull on the dyno I gained 2 HP and there was no change to the AFR. Not worth my efforts. My 2¢.
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Bob, a glutton and a winebibber, a friend of bartenders and sinners!
Sportys tend to keep getting faster the longer you own them.
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27th July 2008
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Flat Track Champion
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Join Date: May 2008
Location: southern indiana
Posts: 621 Sportster/Buell Model: xl1200c Sportster/Buell Year: 2001 Sportster/Buell Model #2: xlch900 sportster Sportster/Buell Year #2: 1966
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off the top of my head i think i went from a 175 on the main to a 180 and from a 42 on the slow to a 45. but if yours is an Ryou may already have those i may be wrong but i think the R has different jets than the C
Last edited by sporty01; 27th July 2008 at 20:28..
Reason: added information
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27th July 2008
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Flat Track Racer
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Join Date: Jul 2007
Location: Near many, many Mexican restaurants
Posts: 234 Sportster/Buell Model: XL 833C Sportster/Buell Year: 2007
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Quote:
Originally Posted by Bob F
On my 2007 1200 I did the Gronk mod to the mufflers, opened up the AC backing plate and installed the K&N AC. When I had a baseline pull on the dyno I gained 2 HP and there was no change to the AFR. Not worth my efforts. My 2¢.
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Exactly. I got a K&N air filter, Rush 1.75" slip-on mufflers, drilled out the back plate for the air cleaner, and SHAZAM, almost no perceivable change. A little, but my golly, what a lot of work and money for almost nothing. And the plugs looked fine, and the oil temperature was fine without any change of program.
The Rush mufflers do sound nice though. La de dah.
__________________
Your motorcycle is like your toothbrush, but it hurts a lot more if you drop it on your foot.
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27th July 2008
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Flat Track Champion
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Join Date: May 2008
Location: southern indiana
Posts: 621 Sportster/Buell Model: xl1200c Sportster/Buell Year: 2001 Sportster/Buell Model #2: xlch900 sportster Sportster/Buell Year #2: 1966
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Quote:
Originally Posted by powellsanmiguel
Exactly. I got a K&N air filter, Rush 1.75" slip-on mufflers, drilled out the back plate for the air cleaner, and SHAZAM, almost no perceivable change. A little, but my golly, what a lot of work and money for almost nothing. And the plugs looked fine, and the oil temperature was fine without any change of program.
The Rush mufflers do sound nice though. La de dah.
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K&N only claims 1 to 4 horsepower increase so yours is right in line with what they claim. |
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