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K & N filters - Any Good ?
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Posted by: old#48---------------------
Anybody know anything about K & N filters ? Reason I ask is because I (like many) always thought they were good until I saw the following info at the two links shown below. I have one in my pickup, but, luckily, I have Twin-Air's in my bikes. I guess the 2nd chart could be biased, but the 1st chart may be legit.
Note about Chart 1: I have sent a e-mail to Ed H. to find out the original source.
Filter Comparison Chart 1
Filter Comparison Chart 2
Posted by: MoO_coW---------------------
If im not mistaken those are for car filters, K & N doesnt use guaze material for there dirtbike filters they use foam.
edit- I was mistaken 
Posted by: old#48---------------------
Well, I thought - "I hope he's right" but then I looked at K & N Powersports which is their motorcycle/atv/jet-ski site and they all look like the same gauze stuff to me. Take a look.
K & N Powersports Site
Posted by: xr400forever---------------------
I had one ....they do use guaze and I could always see tiny pinholes which scared me. Went back to sponge!
Posted by: old#48---------------------
More links about K&N :
K&N Test Link 1
K&N Test Link 2
Note: you can e-mail in the 2nd link and he will send you more test info.
Now I am starting to understand why the mass-air-flow sensor in my Ranger (4.0 V-6) gets dirty all the time (duh) - if I don't clean the sensor frequently, it pings big time. Looks like I wasted $50 on that K&N.
Posted by: cladoo---------------------
I have used K&N filters for many years on my two-strokes with no problems other than the occasional over oiling. I would like to get one for my KTM but they don't make them. I like how easy they are to clean and maintain. Your hands and everything else stay clean not all sticky. Make sure when you clean them that you don't blow them out with air ( I've seen it) . After oiling and installing do not try to race immediatley, run the bike for a while in case you over oiled it, it will run rich until the excess oil is gone then the bike will run fine. I also find that you don't have to clean them as often.
Posted by: tigerowner---------------------
If you clean your filter after every dusty ride you will have no trouble with a K&N. I have one and have been using it for years. K&Ns flow more air than foam and are great in large 4strokes. If you ride in extreamly dusty or sandy conditions I would stick to foam. You can use spray on foam oil if you know you are going to be in a dusty area but this will richen your carb and reduce air flow but will stick the particles better due to the tacky nature of foam oils.
For trail or enduro use the K&N is great. for dusty desert areas or track with lots of riders stick with foam.
For older bikes you can get a K&N for anything and it is better than stock.
Posted by: Studboy---------------------
Everybody at the sand dunes with a high performance quad uses K&N filters with a prefilter over the filter. I have a K&N on my brothers PW80 and I haven't seen any dirt get through it. I wonder if they really do filter as bad as people say?
Posted by: SndyRds---------------------
I used K&N's for years on my large 4 strokes. Alot of the desert racers in So. Cal. use them. You might want to check the AMA Dist. 37 web site. All these guys race in very dusty and sandy conditions. I didn't have any problems with them. A true bolt on performance product that you can feel the power increase.
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