View Full Version : K&N/Alum. Air box users... Need your help please!
QuadJunkies
10-31-2005, 11:44 AM
What size of K&N are you running?? Mine wont fit in my Air box:confused:
this is the Airbox I just installed...The bottom of the filter is too big and wont allow to fit properly on the boot...
QuadJunkies
10-31-2005, 11:45 AM
This is NOT a UM box... But I cant remember who makes it either... :huh :o
I used my stock sized K&N. It almost looks like a CFM airbox but they usually have a slant for the chain. My battery sits 90 degrees to yours also.:huh
QuadJunkies
10-31-2005, 12:40 PM
mine was just sitting n place, its not bolted in yet. ;) We have to do some minor modifications to make it fit properly.
This is the K&N I have right now ... Its too FAT (the bottom interferes with the boot) I also had t oslide the box one inch forward to fit properly( I have the 450r carb)
Franky G
10-31-2005, 12:55 PM
UM Desing sell a small cone size k&n filter that wath you mai need heres some pics of my aluminium airbox its a UM but i got a big crome k&n in there and it fits and thats all (Very very tight fit)
http://www.bikepics.com/pics/pics/honda-400ex-99-bikepics-457832.jpg
http://www.bikepics.com/pics/pics/honda-400ex-99-bikepics-457833.jpg
http://www.bikepics.com/pics/pics/honda-400ex-99-bikepics-457834.jpg
http://www.bikepics.com/pics/pics/honda-400ex-99-bikepics-457835.jpg
QuadJunkies
10-31-2005, 12:57 PM
that^^ looks just like mine, but mine isnt fitting right its too big...
QuadJunkies
10-31-2005, 12:59 PM
in your pic here... from the bottom of the air box to the boot,thats where my filter is too FAT.
http://www.bikepics.com/pics/pics/honda-400ex-99-bikepics-457833.jpg
QuadJunkies
10-31-2005, 01:01 PM
also, does your box angle where the filter Is?? Mine doesnt, but yours looks liked it does.. Again ,mine isnt UM
NacsMXer
10-31-2005, 01:04 PM
I have a UM airbox and I used to run a 400EX K&N in it. It's just like Franky G's how it ramps down towards the intake boot but ramps up towards the battery. That's weird how QJ's won't fit because it looks even deeper because it is square and doesn't have that ramp by the battery. Even with UM's they say you can't run a K&N but I made it fit just fine.
I'm now running a UNI and I like it a LOT better than my K&N. The K&N was passing a lot of fine dirt into my intake boot and I maintained it properly so I made the switch. I bet a UNI would fit in there fine since it is foam and might conform to the shape of your airbox better. It is a bit more narrow in diameter but is also slightly longer than a K&N however. You could also just cut out a relief notch at the bottom of the airbox where your K&N is coming into contact. Hope you can figure out something to make it all work :)
QuadJunkies
10-31-2005, 01:07 PM
Im atucally the opposite, We dont carefor Uni's and prefer a K&N. NEVER,EVER had an issue with dirt passing...
I think(not positive though) that the box is indeed the CFM box but mines flat ... I thought this was a stock 400ex K&N but not positive.. :confused:
I didnt hear anything from these guys on the airbox notrunning a K&N... LOL Trust me... Ill find a way to run it ... :D
QuadJunkies
10-31-2005, 01:15 PM
This is what I have..
http://cgi.ebay.com/ebaymotors/HONDA-400EX-ALUMINUM-AIR-BOX-HIGH-FLOW-AIRBOX-ATV_W0QQitemZ4586211797QQcategoryZ43972QQssPageNam eZWDVWQQrdZ1QQcmdZViewItem
2001300exguy
10-31-2005, 02:03 PM
thats the same box i have i had a k&n in there and it fit fine but i ditched it for a white brothers power filter. i was also wondering how you moved it forward since i was thinking about getting a 450r carb this winter
QuadJunkies
10-31-2005, 03:41 PM
You just take the whole box and move it forward an inch, and make a longer tab for the mounting bracket that goes on the seat latch .
prepracing
10-31-2005, 07:03 PM
thats the same box as mine ( I bought mine from same auction on ebay), I have a 400ex K & N and it fits but the end cap on the filter does sit very tight against the bottom of the airbox. Did you lube up the metal neck on your filter so it butted all the way up against the boot ? Or maybe just take a hammer and make a small indention in the bottom of your airbox
I would just go with the K and N someone else stated that is smaller and will fit fine. Instead of denting or cutting or jerry rigging anything.
QuadJunkies
11-01-2005, 10:09 AM
No way am I cutting a new box thats for sure! lol :eek2:
QuadJunkies
11-03-2005, 01:47 PM
welll.. this SUCKS!. They dont make another filter to kit!:mad: (K&N) I REALLY didnt want to go with a Uni personally, but now all the wiring is re-done so Ill have to for now :(
What filter "PROPERLY" fits in this box?????
The way I C it is they should have mentioned this on there site so buyers liek myself would know better.:rolleyes:
Does the filter fit the boot itself when the airbox is out of the question?
QuadJunkies
11-03-2005, 11:38 PM
Originally posted by ZSK
Does the filter fit the boot itself when the airbox is out of the question? yes... BUT, when it sits in the box, from the bottom its TOO BIG and causes it to not fit right with the intake boot. I had NO air box before. I was hoping for a cone shaped or somthing but K&N said they dont make one for the dimentions we asked for. :(
fasterthanyouex
11-05-2005, 03:08 PM
Should got a CFM box...but i bet you got this one alot cheaper.. Sorry but i didnt understand... your uni fits in the box right?
QuadJunkies
11-05-2005, 03:17 PM
We talked to the owner of this box and we THINK we figured out the solition to run the K&N, the guy told us he uses a K&N so we know it can be done :)
QuadJunkies
11-05-2005, 03:17 PM
Originally posted by fasterthanyouex
Should got a CFM box...but i bet you got this one alot cheaper.. Sorry but i didnt understand... your uni fits in the box right? a Uni should fit with NP.
QuadJunkies
11-07-2005, 11:28 PM
The manufactuer called us and we got her dialed in....
All we had to do was cut a little bit off the end of the K&N to shorten it up a bit. It now fits:) MY ole man done something les,not sure right noff hand but we did get it to fit good .
NacsMXer
11-08-2005, 12:00 PM
Glad you got it to work QJ :) . Seems like a lot of aftermarket parts these days need to be tweaked to work properly :ermm:
I'm digging the new Fullbore's I see in your avatar. Looks sick! Do you have some more pics of it?
QuadJunkies
11-08-2005, 12:30 PM
Originally posted by NacsMXer
Glad you got it to work QJ :) . Seems like a lot of aftermarket parts these days need to be tweaked to work properly :ermm:
I'm digging the new Fullbore's I see in your avatar. Looks sick! Do you have some more pics of it? sure do! I done a rebuild topic on it as well :)
QuadJunkies
11-08-2005, 12:31 PM
I think I took about 30 pics of it :o :p
QuadJunkies
11-08-2005, 12:32 PM
..
NacsMXer
11-08-2005, 06:01 PM
That's badazz QJ. You did a great job on that for sure. Those stealth black sidecases look really trick too! Thanks for the pics :) :macho
2001300exguy
11-08-2005, 08:54 PM
how many horsepower do you gain runing no rear brake lol
QuadJunkies
11-08-2005, 11:23 PM
Originally posted by NacsMXer
That's badazz QJ. You did a great job on that for sure. Those stealth black sidecases look really trick too! Thanks for the pics :) :macho thanks! :)
QuadJunkies
11-08-2005, 11:24 PM
Originally posted by 2001300exguy
how many horsepower do you gain runing no rear brake lol LOL... !!not sure??!!! But Brakes will be done by the wk end ;):p
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