Jump to content
Sign in to follow this  

Should I keep the K&N filter or get a UNI?

Recommended Posts

The guy that I had bought my XR400 from had put a K&N filter on it. I've been reading some posts and it looks like people aren't into K&N's too much. The filter needs to be cleaned pretty badly, but it looks like I could get a UNI filter for not too much more than a K&N cleaning kit costs. What would you guys say to do? I do encounter quite a bit of dust around me when I ride and I'd rather not get a bunch of dirt in my cylinder.

If the general consensus is that I should replace the K&N, what do you guys think of some of the other filters besides the UNI? In the TT store I found a Twin Air and I think a White Brothers. Are those any good, or should I just stick with a UNI?

Also if I do get a UNI (or any other ones), do I need anything from the stock filter? Is there a cage that it goes on or anything? If so where could I get one, cause I'm not sure what my buddy did with all of that stuff from the bike.

Thanks

Share this post


Link to post
Share on other sites

I personally like K&N. Some claim they let dirt in to the cylinder, but I had one on my XR200 with no problems, and I now have one on my XR400. They are easy to clean, spray cleaner and rinse with water, then spray on oil (no sticky foam filter cleaner, that must be applied with hands get it to soak in well).

Not only that they have amazing customer support. My old XR200's filter shrunk a little, so I gave them a call told them, they didn't question me or anything, they just sent me a brand new one with new hardware and everything. So if your filter ever shrinks or gets worn out you could do the same.

I have a stock foam filter on my fourwheeler, and it works fine too, but when it gets worn out I'll probably replace it with a K&N. I would stick with the K&N, the cleaning kit is only like $12 or $13, and it lasts a long time.

Share this post


Link to post
Share on other sites
Click here for a current thread which discusses this 'problem'.

Guess I shoud search in more forums than just the XR250/400 forum :thumbsup:

I'll probably end up ordering a UNI and hoping that the dang snow will melt soon so I can go ride. I could probably get away with the K&N but I also frequent a couple of Ford Ranger forums and most people seem to be against them in those too (often because the oil fouls the MAF, as well as poor filtering). With what I hear from so many people I think I'd be best off getting a UNI.

I also see people using a piece of square UNI filter material where they had the snorkle before, could anyone tell me or post a picture of exactly how you attach a piece of filter there?

Share this post


Link to post
Share on other sites

UNI is a much better choice than a K&N. I replace all my filters with UNI's

Share this post


Link to post
Share on other sites

I personally feel more comfortable running a foam filter as opposed to a paper element in off-road conditions. I've been running twin-air air filters with the twin-air filter cage ever since I bought my bike a few years back. I use the Twin-air "system" to clean and oil the filters. Basically, the "system" consists of a large bucket that holds one gallon of the cleaning solution, and a smaller bucket that you use to oil the filters with. I use the original Twin-air cleaner and oil - I do not use the Bio cleaner / oil. I've been very satisfied with Twin-Air's products.

Share this post


Link to post
Share on other sites

I participate in a diesel truck forum. After alot of bickering - they sent a bunch of filters to a commercial place for testing. K & N came out on the bottom of the pile in terms of filtering efficiency (passes alot of dirt).

They do breath more free-ly when clean - so things look great on a dyno. But a K & N only has filtering media on the sides - with a metal plate on "the back" of the filter. Given that you are pulling the air through a much smaller surface area with the K & N (versus uni or stock) - add a little dust and it plugs right up.

My opinion on K & N - if you have one, throw it away and put the stock filter back on.

The UNI will pass more dust than the stock filter - but with a more coarse outer layer will not plug as quickly; The UNI is also less restrictive - I notice increase in roll-on response (this is compared to the stock filter with the backfire screen removed from the filter cage).

And FWIW, I use a light aerosol filter oil (kal-gard or pj-1) , less chance of over-oiling the filter , running rich, etc. I love the aerosol filter cleaner too...

jeff

Share this post


Link to post
Share on other sites
I participate in a diesel truck forum. After alot of bickering - they sent a bunch of filters to a commercial place for testing. K & N came out on the bottom of the pile in terms of filtering efficiency (passes alot of dirt).

That wouldn't have happened to be the one where the AC Delco filter came out on top, was it? I read that and it was quite interesting.

Share this post


Link to post
Share on other sites

I do have a K&N on my 86XR600,it has been on there since i got the bike,and it still looks new,but on my 99XR250,I have a UNI and i think its as good a filter as money can buy,never have i ever detected any dust in my air boot,or intake for that matter and they stay clean for a while,at least where I go riding.and by the way,my 86XR600 still runs as strong as a MUH-FUH,geared for top end,this bike will do 100 mph,the motor was done at XR's only back in the 90's,big-bore,head ported suspension,etc.And let me add that I got my XR250 completely stock,60K on the odo,and I took it home and did all the Gorden mods at the same time and dam,did it do the trick!!it woke up a otherwise sleepy motor and made it fun to go riding!! XR280 in the near future!!you bet!!..Right now im buying a new back tire for the 250,see you back out there in a few..

Share this post


Link to post
Share on other sites
That wouldn't have happened to be the one where the AC Delco filter came out on top, was it? I read that and it was quite interesting.

yup.

jeff

Share this post


Link to post
Share on other sites

Depends on the type of conditions you ride in. If you ride in dusty, muddy, nasty conditions then a Uni is the best anything other then that, mainly open road, K&N is ok.

Share this post


Link to post
Share on other sites

Great air filter the uni just make sure u line it up properly when u putting it on i check mine with the seat off and look through were the snorkel use to be.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By 661Bran28den661
      What’s up guys. Totally new here picked up an XR400R I live in the desert so I’m riding often and enjoy it. But I am having some issues with my  01 XR400R. I brought it out this morning for a putt and it seems to be choking up in the top of second. Like a bog an go bog an go. First seemed fine and third I didn’t make it high enough into the rpms to see. Before I brought it back to the garage. Yesterday I also changed the air filter back to an uni. I had seen the other one had a hole in it and the box was dirty gunned up and oily. I removed the airbox gave it a good clean out wiped everything down very well put a piece of screen over the snorkel Or where it used to be I should say. “Lightly oiled the filter.Also the spark arrester an tip for the bike it did not come with I ended up making one with a piece of flat steel and drilling holes. Whilst doing this. I found also a crack in the pipe. It almost sounds as like there’s a vacuuming or whistle? When revving.The first one I had made worked fine I had no issues. This one I am wondering maybe if it’s a cause of a little too much back pressure.So I’m assuming it’s either a Carb or exhaust problem. Or something that could totally be minuscule. Or major issue. Would definitely like some second opinions and any advice would be greatly appreciated. Thanks guys! 
      TWISTIN THROTTLES & CRACKN BOTTLES


    • By ddickinson
      My lanky 14 year old boy started showing an interest in riding MX/Off-Road so I sourced the best beginner friendly, yet dirt worthy, bike I could find: an Ol' Honda XR250R (2004). So far I've replaced a few clutch levers and perches with stock parts. That's gotten old and I'm looking to upgrade to an ASV or Torc1 type fold-able clutch/perch brake combo. Went to purchase online today and to my surprise there were no such parts listed for the XRs. I saw plenty of CRF/CRF-X choices and they seem to differ depending on generation. Obviously I can use nearly any perch/clutch combo as long as the two match; but I was wondering if anyone knew which of these levers was closest to stock? Also, will the first gen CRF250X brake lever work on the XR? These may be stupid questions to some; but I'd rather ask a dumb question than drop money on an ASV brake lever I can't use. Thanks for any help.
      #xr250r#hondaxr  
       
       

    • By TheLastByte
      Im currently in the market for an xr400r, and considering buying one that's had some heavy engine work done. The current owner claims to have bought it from a friend who's an XR enthusiast. The PO installed a big bore kit and high comp piston, as well as a xrs only pumper carb, rsw triple clamp, aftermarket clutch, street lights, and a whole bunch of bling.
       
      My main concern is the effect the upgrades will have on the engine's longevity. How much quicker will I be going through top ends with the setup on this bike as opposed to a stock setup, and should I be worrying at all about bottom end longevity as well? I wouldn't mind having to eventually redo the top end, but I don't want to deal with a race bike type top end rebuild schedule on an XR. 
      Is there anyone here who's running a bike similar to this one who can give some advice? 
    • By Ralph303
      I have a 2001 Honda XR400R. It has a whirring/grinding sound in the lower end and a vibration in the top end. I pulled the valve cover and everything looks good. Decompression lever looks to be in order. Anyone know where I should start looking or just rebuild the whole engine. Ballin on a budget, but really love this bike. It looks like it’s new otherwise. Oil was jet black and thin. Thanks in advance! 
    • By junglePIG
      Hi, I have an Xr250r with a buckled/ wobbling front wheel, after trying to true the rim i have broken a spoke.
      I am wondering if it is possible to lace any 36 hole aftermarket rim to the oem hub, also will i need to buy an xr250r specific spoke set. also could i take a 36 hole rim from another front wheel and lace that up???? thanks
×