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400EX and Air Filters

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Old Nov 20, 2005 | 09:13 PM
  #1  
URCRAZY's Avatar
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Default 400EX and Air Filters

I was wondering on peoples thoughts on what they think is the best air filter for them and their bike?

I know the style of riding makes a big difference, but what do any of you have, and how do you like it?

I have had a K&N---let sand in my motor, and had to rebuild the motor.

Curtis Sparks foam--did good, until it ripped while cleaning.

Now I have a white Brothers. It has been doing a good job.

I am going to be getting a new filter, but was not sure if I should get the same, or try another.

I ride mostly on beaches, and sand dunes, sand and dirt trails and dirt roads.
 
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Old Nov 21, 2005 | 09:25 AM
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Default 400EX and Air Filters

I just don't trust K&N's! I run UNI foam, and an EHS Racing airbox lid (http://www.ehsracing.com/) that has an Outerwears cover. The Outerwears takes care of the big stuff, so the filter only has to deal with the stuff that gets by the Outerwears.

Two cautions on the UNI filters. They come with a wire insert that replaces the very restrictive stock screen insert. The insert has a plastic collar that is square, but will eventually deform under the stress of the band that holds the filter in place. (This is something that UNI should definitely redisign, and make it stronger!) Inspect it often, and replace it when it begins to get tapered.

Also, even a foam filter will need to be changed frequently under severe conditions. I have 3 filters for each bike.......one on the machine, one fresh one oiled up and ready to go, and one in the wash.
 
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Old Nov 21, 2005 | 09:30 AM
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Default 400EX and Air Filters

Like Reconranger, I don't run the K&N's. I would stick to foam filters for off-road use. As long as they are oiled good they all work fine, I run UNI and TWIN AIR.
 
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Old Nov 21, 2005 | 12:12 PM
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Default 400EX and Air Filters

Originally posted by: motox26
Like Reconranger, I don't run the K&N's. I would stick to foam filters for off-road use. As long as they are oiled good they all work fine, I run UNI and TWIN AIR.
Amen!
 
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Old Nov 21, 2005 | 01:08 PM
  #5  
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Default 400EX and Air Filters

Never minded playing the devil's advocate. I'm not arguing dusty conditions BUT a non-defective properly oiled and mounted K&N WILL NOT not let sand through. Period. Have at least 8 years total use in the sand with a K&N. Don't believe in pre-filters either. Even have one out in the open right behind the front left tire and the engine was spotless when I put my new cylinder kit on. And that was the 2nd engine I've had open after using K&N.

So I call BS.
 
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Old Nov 21, 2005 | 01:19 PM
  #6  
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Default 400EX and Air Filters

i want to be upfront with this...i am not saying K&N filters are bad i use one myself, but the problem most ppl have with them is they are hard to keep clean without damaging the gause element. it is almost impossible to get all of the dirt out of all of the little ribs around the whole filter. this is why i use a dualstage foam filtercover and an outerwear cover. my brother use to race karts and this is where i got the idea. the outerwear and foam filter would be caked in dirt after a race but the K&N would be spotless as well as the intake. it might be overkill but hey...better safe than sorry!
 
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