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Old 10-26-2010, 07:07 PM   #1
dims
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K&N Air Filter damaging to bike vs Stock?

I tried to seach but couldn't find it, but there is a thread here about K&N filter being more damaging to your bike than the stock as with logic, increased air flow, means bigger spacing in the filter and it obviously allows more dirt particles to flow through.

Someone said that with a K&N they're good for the track as tracks have less day to day dirt, but when riding in the street, there is just a lot more shit that the bike picks up, and over time the inside of the engine is all scratched n worn more, than if you had a stock air filter.

Can anybody shed any more light on this please?

-dims
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Old 10-26-2010, 07:09 PM   #2
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Re: K&N Air Filter damaging to bike vs Stock?

I don't see that happening. K and N has been around a long time. If they where blowing engines up they wouldn't last long as a company.
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Old 10-26-2010, 07:25 PM   #3
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Re: K&N Air Filter damaging to bike vs Stock?

Nah not blowing up, but someone was saying you could see a noticeable difference just from looking at it.
They had two bikes, one with a K&N and one with a stockie, from new, and after 10,000 or 20,000 k's the one with the K&N had rougher piston walls from the accumulation of dirt that the K&N would let through....

But yeah, don't know if its an urban myth or not, but it made me paranoid! i ride my bike and picture the walls getting rougher each time
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Old 10-27-2010, 12:38 AM   #4
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Re: K&N Air Filter damaging to bike vs Stock?

there are threads that have been over this. some say it is better to have stock, some say k&n is good. Personally i think that if you oil them properly that it helps prevent them from letting extra through. The k&n oiling process allows a lot of human error in as some have said in pprevious posts. personally i run one, my choice. it does help with performance. I have yet to see physical evidence of extra damage to piston walls and until then ill stick to the k&n. just my 2 cents.
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Old 10-27-2010, 01:06 AM   #5
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Re: K&N Air Filter damaging to bike vs Stock?

dont confuse the k&n (or bmc) race filters with their street filters. Huge difference there...either way tho you would need to do oil changes i guess more frequently by going with a more free flowing (particle allowing) filter...that should be a given.
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Old 10-27-2010, 04:39 PM   #6
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Re: K&N Air Filter damaging to bike vs Stock?

I use k&n for almosst two years now. Just had engine rebuilt and my mechanic didn't say anything about any type of damage to the pistons or walls.
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Old 10-27-2010, 08:59 PM   #7
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Re: K&N Air Filter damaging to bike vs Stock?

Bmc ftmfw
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Old 10-30-2010, 04:33 PM   #8
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Re: K&N Air Filter damaging to bike vs Stock?

These so called "high performance" filters may help make your bike produce like 1/2 extra HP or something, while not doing as good of a job protecting your engine as the stock filter; stick with the stock filter, at least on the street...
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Old 10-30-2010, 04:38 PM   #9
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Re: K&N Air Filter damaging to bike vs Stock?

More air = more dust/dirt that comes in with it. If you are in dusty environments is the tradeoff worth it to you? An aftermarket filter will gain you about 1 or 2 extra HP with a proper fuel retuning.

You are the one who has to weigh the options.
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Old 10-30-2010, 04:46 PM   #10
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Re: K&N Air Filter damaging to bike vs Stock?

I had a bmc race on my 99 r1 for 40k miles and after living in MN when it was rebuilt it looked like new. Regular maintenance and i've never seen minor things really hurt a bike as most don't reach the mileage it takes for the brand of oil, oil filter, air filter, etc to really come into play. How many bikes even hit 50k? Or even 100k?
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Old 10-30-2010, 04:57 PM   #11
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Re: K&N Air Filter damaging to bike vs Stock?

Just cleaned and reoiled my K&N today and everything visually still looks good. No damage to the throttle botties not even a scratch anywhere.
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Old 10-30-2010, 05:57 PM   #12
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Re: K&N Air Filter damaging to bike vs Stock?

Theoretically a RACE version filter will allow more particulate through, and as such do some damage to the bike over time. How much, and is it enough to worry about for you is a question of debate.

The street versions of the aftermarkets really arent usually any better performance wise than the OEM filter. The only real bennefit to the K&N filter, and the BMC street, is that it is a one time purchase, and can be cleaned. OEM can not, and they are not cheap.
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Old 10-30-2010, 11:56 PM   #13
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Re: K&N Air Filter damaging to bike vs Stock?

I got a K and N just because you can reuse it, didn't really care about performance.
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Old 10-31-2010, 01:34 AM   #14
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Re: K&N Air Filter damaging to bike vs Stock?

on cars, one of the things people mentioned about K&N is how the oil could damage the throttle bodies. i never found out if this was true or not. i like the fact that you can wash and reuse the filter. it can save some cash for quite a long time. have you tried to do a search on this? K&N is widely debated on most car/bike forums.
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Old 10-31-2010, 08:26 AM   #15
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Re: K&N Air Filter damaging to bike vs Stock?

if the k&n isn't properly oiled then yes, you will have an issue only because the oil helps the dirt stick to the filter as the media is obviously not as dense as a stock filter, but then again over oiling can cause the bike to be less response due to the oil getting on the throttle plate and valves and over time sticking. If one is really concerned about it, clean your air box out before you drop in a new filter and periodiccly check the box to see if there is any build-up of dirt or heavy partilces in there, if there is then you have a problem and if not then your fine. I use pipercross as I don't like k&n style filters, not even on my car(s), the pipercross needs cleaned and oiled as well but with out the oiling it looks like it can still do the job properly
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Old 10-31-2010, 08:28 AM   #16
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Re: K&N Air Filter damaging to bike vs Stock?

Quote:
Originally Posted by JetBlast View Post
on cars, one of the things people mentioned about K&N is how the oil could damage the throttle bodies. i never found out if this was true or not. i like the fact that you can wash and reuse the filter. it can save some cash for quite a long time. have you tried to do a search on this? K&N is widely debated on most car/bike forums.
not so much damage but coat the tb and air sensors, maf, map or what ever air sensor one would have a decrease performance
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Old 10-31-2010, 06:33 PM   #17
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Re: K&N Air Filter damaging to bike vs Stock?

Quote:
Originally Posted by CrickiKaze View Post
if the k&n isn't properly oiled then yes, you will have an issue only because the oil helps the dirt stick to the filter as the media is obviously not as dense as a stock filter, but then again over oiling can cause the bike to be less response due to the oil getting on the throttle plate and valves and over time sticking. If one is really concerned about it, clean your air box out before you drop in a new filter and periodiccly check the box to see if there is any build-up of dirt or heavy partilces in there, if there is then you have a problem and if not then your fine. I use pipercross as I don't like k&n style filters, not even on my car(s), the pipercross needs cleaned and oiled as well but with out the oiling it looks like it can still do the job properly
Screw all that; stick with stock...
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Old 11-01-2010, 02:36 PM   #18
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Re: K&N Air Filter damaging to bike vs Stock?

Quote:
Originally Posted by CrickiKaze View Post
not so much damage but coat the tb and air sensors, maf, map or what ever air sensor one would have a decrease performance
not to go off topic but i noticed you are from j-ville. i grew up in havelock all my life with marines

i heard alot of mixed things with the filter on different cars. i have owned way too many cars and keep hearing random issues with the filters. personally i still use them just due to the fact they can be cleaned easily!
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Old 11-01-2010, 04:00 PM   #19
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Re: K&N Air Filter damaging to bike vs Stock?

Quote:
Originally Posted by Driving_Miss_Daisy View Post
I got a K and N just because you can reuse it, didn't really care about performance.
Likewise here.

--Wag--
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Old 11-01-2010, 04:15 PM   #20
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Re: K&N Air Filter damaging to bike vs Stock?

Quote:
Originally Posted by CrickiKaze View Post
if the k&n isn't properly oiled then yes, you will have an issue only because the oil helps the dirt stick to the filter as the media is obviously not as dense as a stock filter, but then again over oiling can cause the bike to be less response due to the oil getting on the throttle plate and valves and over time sticking. If one is really concerned about it, clean your air box out before you drop in a new filter and periodiccly check the box to see if there is any build-up of dirt or heavy partilces in there, if there is then you have a problem and if not then your fine. I use pipercross as I don't like k&n style filters, not even on my car(s), the pipercross needs cleaned and oiled as well but with out the oiling it looks like it can still do the job properly

Bottom line is what I call the 10% rule. You have to be at least 10% smarter than what you are using or it will never work right.


If a K&N is used PROPERLY per their instructions, you will never have any issues with it. It filters as good or better than OEM, and flows marginally better.

The best thing it has going for it is that it is re-usable.
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