Anyone use K&N Filters on your 4 strokes

gohugenow
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gohugenow
Edited Date/Time 1/25/2012 4:31am
How do you like them. Do they make a Airbox version for a 2009 CRF 450?
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Slow ~ Pro
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Slow ~ Pro 11/3/2008 7:50am
11/3/2008 7:50am Edited Date/Time 4/16/2016 9:05pm
I have used many K & Ns in my racing Mini bikes a K & N will add more HP to a stock CRF100, than a trick exhaust. But I have heard, (and this is just hear say) than fine particles of dust can travel through the gauze/paper, element. In really dusty conditions, they might be harmful.

I think the concept is great, if you were to take apart a K & N filter, you would clearly see the difference in surface space. The pleats make for a make much greater area of intake.

I think a good magazine test is in order...I'll get right on it !
(giggle)
babba boey
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babba boey 11/3/2008 9:53am
11/3/2008 9:53am Edited Date/Time 4/16/2016 9:05pm
If you ride in fine dust a K&N filter will suck dirt thru. For supermoto and supercross they would be fine but I would not run one on a MX bike.

How many teans use them in the MX series?
Larry
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Larry 11/3/2008 10:33am
11/3/2008 10:33am
I have one on my Mustang
motofab36
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motofab36 11/3/2008 10:43am
11/3/2008 10:43am Edited Date/Time 4/16/2016 9:05pm
I talk people out of using them almost daily here in my repair shop. Most of these kids around here ride in the river bottoms and creeks and trails, etc. and I don't think the K&N will stop as much as as a good oiled foam filter.

The Shop

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Racer92
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Racer92 11/3/2008 10:48am
11/3/2008 10:48am Edited Date/Time 4/16/2016 9:05pm
I have found this interesting when K&N comes up. Every sprint car owner Ive ever know personally (me included) ran K&N with good results and some of the dirt tracks we ran are dusty as any scramble track Ive ever raced when they get dry slick. It would be interesting to see independent/objective lab stats on that issue.
Highsider
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Highsider 11/3/2008 11:29am
11/3/2008 11:29am
babba boey wrote:
If you ride in fine dust a K&N filter will suck dirt thru. For supermoto and supercross they would be fine but I would not run...
If you ride in fine dust a K&N filter will suck dirt thru. For supermoto and supercross they would be fine but I would not run one on a MX bike.

How many teans use them in the MX series?
Don't most, or all, Baja teams run them? I would think there is more silt dust there than any other type of bike racing conditions.

Jimi J
williamsmotowerx 11/3/2008 11:44am
11/3/2008 11:44am
I personally have never used them, but I cringe when tis subject comes up... because I know people will say they let smaller dirt get through.

I have still yet to see proof that this happens.

oiling a filter is what prevents this, even a foam filter will let dust through if it's not oiled.
Castor Oil
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Castor Oil 11/3/2008 12:06pm
11/3/2008 12:06pm
ctaylor209 11/3/2008 12:17pm
11/3/2008 12:17pm Edited Date/Time 4/16/2016 9:05pm
I rode for K&N all through 07 and I will say my CRF 250s made a slight bit more power with the filters. Be careful running them in any kind of dusty conditions though! I went through a set of intake valves in my practice bike and my 450 because the filter let fine dust through. They are really good filters for ax/sx stuff or well prepped mx tracks with no dust.
minidad160 11/3/2008 2:47pm
11/3/2008 2:47pm
I bought my son a cr85 used that came with a k,n filter tried it for a couple races cleaned it and oiled it the way they want you to (pain in the ass). After bogging isues and cleaning the carb (lots of dirt inside) went back to foam filter. No problems since. I wouldnt run them anymore.
123
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123 11/3/2008 3:10pm
11/3/2008 3:10pm
ctaylor209 wrote:
I rode for K&N all through 07 and I will say my CRF 250s made a slight bit more power with the filters. Be careful running...
I rode for K&N all through 07 and I will say my CRF 250s made a slight bit more power with the filters. Be careful running them in any kind of dusty conditions though! I went through a set of intake valves in my practice bike and my 450 because the filter let fine dust through. They are really good filters for ax/sx stuff or well prepped mx tracks with no dust.
EVERYONE goes through valves on a Honda four stroke you retard.
SteveS
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SteveS 11/3/2008 3:16pm
11/3/2008 3:16pm Edited Date/Time 4/16/2016 9:06pm
Suns_PSD wrote:
Proof that K & N's are absolute crap.

http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm
Interesting test, but it does show that K&N filters flow freer and restrict less. That's what they claim.

It also shows that to capture more dust, you have to restrict airflow more (like a paper filter).

But to be applicable to dirt bikes the test needs to compare K&N dirt bike filters to foam dirt bike filters.

I would bet foam filters pass a lot more dirt than paper car filters too.
Devil1nNj
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Devil1nNj 11/3/2008 3:52pm
11/3/2008 3:52pm
Run one on my 6.0 International Diesel . Smile

If the filters are similar in construction (which I bet they are more dust reducing ) I would personally never run one on my bike. I am also anal when it comes to maintenance and clean and oil my filters every day of riding.

I love the pre oiled 10 dollar filters as back ups, and keep like 4 oiled in zip locks in the trailer.
Tiki
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Tiki 11/3/2008 3:53pm
11/3/2008 3:53pm
No Toil. Done.
Slow ~ Pro
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Slow ~ Pro 11/3/2008 3:58pm
11/3/2008 3:58pm
Tiki wrote:
No Toil. Done.
X10

I use No Toil...The filters never, "NEVER", have dirt/dust on the inside, plus, they (the filters) last longer...God Damn-it !
motofab36
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motofab36 11/3/2008 3:59pm
11/3/2008 3:59pm
Tiki wrote:
No Toil. Done.
yup!

Pit Row

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strongsurvive405 11/3/2008 4:07pm
11/3/2008 4:07pm
I will live and die by PC Flo filters, for motocross and sportbikes. I've tested and used EVERYTHING there is out there for both motocross and sportbikes. PC Racing will have out some seriously cool s**t for sportbikes really soon. The time, testing procedures, research, and people behind their products are awesome. Every one of my motocross bikes have the PC Flo Air and Oil filters. If you have anymore questions just ask. I test for a lot of the major companys out there for both mx and sportbike aftermarket company's.
Lightning78
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Lightning78 11/3/2008 4:08pm
11/3/2008 4:08pm
No Toil is the best stuff hands down, been using it for years now and never seen better results ..... plus it's the least messy of all the air filter products I do mine in my kitchen sink! Cheerful
Slow ~ Pro
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Slow ~ Pro 11/3/2008 4:16pm
11/3/2008 4:16pm
Lightning78 wrote:
No Toil is the best stuff hands down, been using it for years now and never seen better results ..... plus it's the least messy of...
No Toil is the best stuff hands down, been using it for years now and never seen better results ..... plus it's the least messy of all the air filter products I do mine in my kitchen sink! Cheerful
I do mine in the wash machine.
Bret28g
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Bret28g 11/3/2008 4:23pm
11/3/2008 4:23pm
i wouldn't run one on anything offroad. i run one on my truck, but i also maintain it...something a lot of people neglect to do.
minidad160 11/3/2008 4:33pm
11/3/2008 4:33pm
no toil no mess and seems to be as good as any other filter.(I do mine in the kitchen sink too or in a bucket or at the track in a trash can or whatever holds water) GREAT STUFF!
ctaylor209 11/3/2008 4:56pm
11/3/2008 4:56pm Edited Date/Time 4/16/2016 9:06pm
123 wrote:
EVERYONE goes through valves on a Honda four stroke you retard.
From 05-07 I owned 8 Honda 250fs and 3 Honda 450s and I only had valve issues when running the K&N... I had a practice bike in 05 with 180 hours on it and never even had to adjust the valves. I know the CRFs are famous for going through intakes like crazy, but most of the time there is a maintenance issue... who's the retard now?
Bret28g
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Bret28g 11/3/2008 5:10pm
11/3/2008 5:10pm
i agree, maintenance is usually the issue. i work at a honda dealer and i've seen some bikes come in multiple times for valve jobs, honda or not, and they always have dirty air filters. i had a 2004 crf250 and raced it for two seasons with no engine problems, but i changed my oil/filter, air filter, and trans fluid every race.
Slow ~ Pro
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Slow ~ Pro 11/3/2008 5:31pm
11/3/2008 5:31pm
Bret28g wrote:
i agree, maintenance is usually the issue. i work at a honda dealer and i've seen some bikes come in multiple times for valve jobs, honda...
i agree, maintenance is usually the issue. i work at a honda dealer and i've seen some bikes come in multiple times for valve jobs, honda or not, and they always have dirty air filters. i had a 2004 crf250 and raced it for two seasons with no engine problems, but i changed my oil/filter, air filter, and trans fluid every race.
Man, good point...
But anyone that has a race bike, should know to do the same.
People always talk about how if, or when, a 4-stroke blows it cost so much to repair.
I have never blown one up !
Matt Fisher 11/3/2008 5:42pm
11/3/2008 5:42pm
No Toil's not bad stuff, but I lunched a motor tipping over in a really big, silty puddle. I thought it was just bad luck, but come to find out it's not that unusual. This video seems to back up the thought that a different brand of oil might have not allowed the silt/water in.
http://www.youtube.com/watch?v=fpzK6Wm_BDs
raddad
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raddad 11/3/2008 5:59pm
11/3/2008 5:59pm Edited Date/Time 4/16/2016 9:06pm
Bret28g wrote:
i agree, maintenance is usually the issue. i work at a honda dealer and i've seen some bikes come in multiple times for valve jobs, honda...
i agree, maintenance is usually the issue. i work at a honda dealer and i've seen some bikes come in multiple times for valve jobs, honda or not, and they always have dirty air filters. i had a 2004 crf250 and raced it for two seasons with no engine problems, but i changed my oil/filter, air filter, and trans fluid every race.
Slow ~ Pro wrote:
Man, good point... But anyone that has a race bike, should know to do the same. People always talk about how if, or when, a 4-stroke...
Man, good point...
But anyone that has a race bike, should know to do the same.
People always talk about how if, or when, a 4-stroke blows it cost so much to repair.
I have never blown one up !
I have raced 4 stks since 72 and never have blown one either. I have also raced ring-dings for 20 years and they blow quite easily unless you are replacing pistons, rings and cranks religiously.

I have tried the K&N and they are shite~!

If you use a K&N , just feel inside the carb boot on a 4 or 2 stk and it will be dirty even sandy if you ride Southwick. They are worthless pieces of crap. If anyone that rides dirt says different then they are lying or are simply not checking for dirt inside the boot, carb and motor. Don't even try one on a dirt bike or you will pay dearly.

BTW the deal about Honda's eating valves is an old wives tale, I have had them since 04 and NEVER have had a valve issue and NEVER had to adjust them! Hell i have never even put in rings. I do normal recommended oil and filter changes and that's it. I check the clearance twice a season. I keep a bike one or two years and have put hundreds of hrs on them. I practice 2X a week and race every weekend possible in the summer plus in Brasil all winter (summer there) and no problems at all.
raddad
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raddad 11/3/2008 6:00pm
11/3/2008 6:00pm
Slow ~ Pro
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Slow ~ Pro 11/3/2008 6:23pm
11/3/2008 6:23pm
Matt Fisher wrote:
No Toil's not bad stuff, but I lunched a motor tipping over in a really big, silty puddle. I thought it was just bad luck, but...
No Toil's not bad stuff, but I lunched a motor tipping over in a really big, silty puddle. I thought it was just bad luck, but come to find out it's not that unusual. This video seems to back up the thought that a different brand of oil might have not allowed the silt/water in.
http://www.youtube.com/watch?v=fpzK6Wm_BDs
I remember that clip...It's funny how the maker of the clip works best. I am a part time actor, recently playing the part of a man with a diseased heart, yet my heart is fine...go figure, Hollywood makes you believe !

Falling down in water deep enough to cover your air box, can never be good.

I don't trust that test, I think if I had the time, and wanted to test as in the film, three, or four, different filter oils, I would use new filters, not ones with gapping tears in it.

I call bunk, on that film. But what the point is here is dust, and how you feel about what you choose to run. I have run a lot of different oils in the past. Still, I'll stick with No Toil. And..AND, I'll bet I could load enough No Toil, on to a foam filter, to pass that test. Just my opinion.

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