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Posted by Dusty on October 4, 2007, 7:33 am
Have any of you put on a K&N air filter and if so what do you think of the
performance of it ?
Dusty
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Posted by Ken Abrams on October 4, 2007, 9:43 am
> Have any of you put on a K&N air filter and if so what do you think of the
> performance of it ?
K&N would like you to think that their low restriction filters will give you
better performance.
If you change nothing else, you are likely to get WORSE performance.
WHY?
Strict emission standards make it necessary for the mfg. to design their
engines to run as lean as possible. The carb or FI is set to do that with
all the stock equipment (intake and exhaust). If you increase the intake
flow or reduce the exhaust back pressure (without changing the mixture) it
is likely that you will run even leaner and end up with exactly the opposite
of what you wanted.
Is there a place for K&N? Sure, as long as you realize what you are getting
yourself into. Typically to achieve any actual gains (which are often small
and not worth the effort), one must open up the intake AND the exhaust AND
re-jet the carb(s) or reprogram the FI. This can be expensive and time
consuming.
Want to see how your bike will run with a K&N? Wait for a calm day when
there isn't a lot of dust blowing around, take the stock air cleaner OFF and
ride it a couple of miles on clean pavement. You may find that it runs so
crappy that you don't get past the first block.
And no, that won't hurt anything.
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Posted by Albrecht via MotorcycleKB.com on October 4, 2007, 10:16 am
Dusty wrote:
>Have any of you put on a K&N air filter and if so what do you think of the
>performance of it ?
Leave the stock airbox in place and just install a K&N replacement filter in
the air box. Then you will never have to buy another paper filter element.
Never remove the airbox.
The airbox is a tuned resonant cavity that helps smooth out the midrange flat
spot around 5000 to 7000 RPM that is so annoying with an inline-4 that has a
4-into-1 exhaust system.
I've installed K&N separate filters on two sportbikes, but I would never make
that mistake again. K&N separates are OK for drag racing, but you lose too
much midrange for canyon riding.
It's not worth all the hassle of re-jetting by installing larger main jets.
The average rider seldom operates his engine on the main jets anyway.
If you're going to tweak with your carburetors, learn everything you can
learn about the idle circuits and part-throttle running, because that's where
you're getting your fuel 90% of the time you're riding.
--
Message posted via http://www.motorcyclekb.com
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Posted by Rob Kleinschmidt on October 4, 2007, 2:03 pm
> Have any of you put on a K&N air filter and if so what do you think of the
> performance of it ?
> Dusty
I replaced a K&N filter with stock and saw no difference
in performance.
>From what I understand, K&N filtering can be all
over the map, depending on how recently the filter
was cleaned. I ride a lot of dusty conditions and was
worried about the K&N possibly allowing more crud
into the engine. The stock filter works fine, does not
impede performance and it's what the engine is speced
for.
I ought to stash a replacement filter though. Thanks for
making me think of this.
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Posted by flynrider via MotorcycleKB.com on October 4, 2007, 5:07 pm
Dusty wrote:
>Have any of you put on a K&N air filter and if so what do you think of the
>performance of it ?
>Dusty
I replaced my OEM paper filter with a K&N. I didn't really expect a
performance difference and didn't see any. Their pod filters will flow more
air, but that opens a whole different can of worms. I got my K&N so I
wouldn't have to fork over big bucks every time I needed a new filter. The
K&N only cost about 1.5 times as much as a new paper filter and can be reused
indefinitely.
John
--
Message posted via MotorcycleKB.com
http://www.motorcyclekb.com/Uwe/Forums.aspx/tech/200710/1
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