K&N or not?

Jkolb · 01-25-2012, 12:08 AM

I had my z at my local shop today and he is completely against k&n air filters, he says he rebuilds motors all the time because they let to much dirt in. Should i keep mine or go to the stock foam?

KFXHELLRAISER · 01-25-2012, 12:15 AM

Yep K&N filters do let fine dust and dirt in. That is why the make the outerwears prefilter's. If your filter needs a filter then that tells it all. Stick with foam.

Jkolb · 01-25-2012, 12:19 AM

I just got the quad and it had the k&n, ill go back to foam, do i need the shop to do it or can i just order the new filter and it slips on there with a clam? will I notice a lot of power loss?

KFXHELLRAISER · 01-25-2012, 12:34 AM

I would say the K&N replaced all the stock stuff and it just clamps on. Is it the stock K&N replacement or is your airbox have a clamp on adapter in it?

sd1 · 01-25-2012, 12:38 AM

k&n's breathe far better than foam, even with an outerwear...i always try to use k&n filters

Jkolb · 01-25-2012, 12:40 AM

It slides onto a metal lip and a hose clamp is there to tighten it down.

z455 · 01-25-2012, 12:53 AM

I just got the quad and it had the k&n, ill go back to foam, do i need the shop to do it or can i just order the new filter and it slips on there with a clam? will I notice a lot of power loss?

There is no reason you should notice a power loss.

k&n's breathe far better than foam, even with an outerwear...i always try to use k&n filters

Yes, they do BREATHE better, but thats all. With out an Outerwears and meticulous maintenance the K&N will let fine dirt and silt through. Thats A widely proven fact. They are great if your drag racing but even then 90% of those guys run an outerwears. The best K&N type filter is the FCI 8 ply filter. Vs the K&N's 4 ply.

It slides onto a metal lip and a hose clamp is there to tighten it down.

Then you can run a universal fit UNI filter ( or any other brand, I prefer UNI.) Measure your current filter and look for one similar on UNI's website.

Jkolb · 01-25-2012, 01:01 AM

I love this website.

Thanks guys.

20redfrogs · 01-25-2012, 01:26 AM

I like K&N filters. I do run prefilters with all of them though. I clean and oil them on a regular basis. I have had no issues with them what so ever.

KFXHELLRAISER · 01-25-2012, 01:32 AM

I used K&N once. I used a stock replacement in a car and after a short time I noticed alot of dirt and debris in the airbox that passed the filter. Never used one again. If you want a good filter stay with a foam type and oil it correctly. I use twin-air filter's. Also had good luck with Uni's.

CFM-Z440 · 01-25-2012, 02:22 AM

K&N filters require a lot of maintenance, and it has to be done properly. I use one and you can white glove my intake any time you wish (wow that sounded gay

No Homo) If you're looking for all you can get and are willing to do the maintenance, and understand how to do it properly,you will be fine with K&N. If not, use something else, but foam fails if neglected too.

Where I think most of the K&N problems start is neglect. Every ricky racer out there thinks they need one, and most of them don't understand the first thing about them. Many of the rest of the issues are from guys that do service them, but don't let them dry completely before oiling them. Oil and water don't mix, so if there's one drop of water still in that filter when you oil it, that's one spot that won't filter out any dirt.

If you service it exactly as they instruct, with their cleaner and their oil, and you do it often enough, you won't have problems.

Pulido221 · 01-25-2012, 02:30 AM

K&N over here

I have an FCI intake off a trx and came with a 8ply filter that comes with it from fuel customs. I went and bought an extreme k&n(same size as FCI filter) and still used the FCI outerwear and I felt a very noticeable touchy snap feeling in the Bottom end power band over the FCI filter. I recharge my k&n after EVERY ride and use outerwear from fuel customs, and I have no air box. It's all up to you and where you ride. If you do get another k&n, get an extreme k&n

I've been using k&n since 2006 when I bought my quad new and rode with same stock valves until this past year. I forgot who I sold my stock jug to, but the stock valves looked so good for being 5 years old, I sent them out to the buyer just in case his valves were cupped, shot, or covered in carbon build up. Maintanance after every single ride is key, and use chevron or shell gas. They use a cleaning additive that helps keep valves clean.

amcf18 · 01-25-2012, 02:33 AM

My 2 layer foam filter has about 3/4 inch of media to trap dirt.. My k&n, about the thickness of a hair.. I can sleep a lot better with the foam on.. I run both, but the k&n with the outerware, doesn"t get far between cleanings...

fastfarmer · 01-25-2012, 06:36 AM

If you can see light through the filter, that means fine, powder dust will get in there..When its VERY dusty I have changed filters in one day !!Be safe is better than sorry cause it doesn't take long to ruin your engine and all performance gains are out the window... UNI

20redfrogs · 01-25-2012, 08:10 AM

If you can see light through your K&N, send it back! They have a lifetime warranty.

01-25-2012, 12:08 AM	#1 (permalink)
Jkolb :::Eiger Rider::: Join Date: Dec 2011 Location: Twain Harte, CA Posts: 581	K&N or not? I had my z at my local shop today and he is completely against k&n air filters, he says he rebuilds motors all the time because they let to much dirt in. Should i keep mine or go to the stock foam?

01-25-2012, 12:15 AM	#2 (permalink)
KFXHELLRAISER :::DVX 400 Rider::: Join Date: Mar 2011 Location: Ky Posts: 969	Yep K&N filters do let fine dust and dirt in. That is why the make the outerwears prefilter's. If your filter needs a filter then that tells it all. Stick with foam. __________________ 2k4 kFx730---Too much to list. 2k3 400ex---(Wifes)

01-25-2012, 12:34 AM	#4 (permalink)
KFXHELLRAISER :::DVX 400 Rider::: Join Date: Mar 2011 Location: Ky Posts: 969	I would say the K&N replaced all the stock stuff and it just clamps on. Is it the stock K&N replacement or is your airbox have a clamp on adapter in it? __________________ 2k4 kFx730---Too much to list. 2k3 400ex---(Wifes)

01-25-2012, 12:53 AM	#7 (permalink)
z455 :::LT500 Rider::: Join Date: Jan 2010 Location: North Carolina Posts: 1,203	I just got the quad and it had the k&n, ill go back to foam, do i need the shop to do it or can i just order the new filter and it slips on there with a clam? will I notice a lot of power loss? *There is no reason you should notice a power loss. k&n's breathe far better than foam, even with an outerwear...i always try to use k&n filters Yes, they do BREATHE better, but thats all. With out an Outerwears and meticulous maintenance the K&N will let fine dirt and silt through. Thats A widely proven fact. They are great if your drag racing but even then 90% of those guys run an outerwears. The best K&N type filter is the FCI 8 ply filter. Vs the K&N's 4 ply. It slides onto a metal lip and a hose clamp is there to tighten it down. Then you can run a universal fit UNI filter ( or any other brand, I prefer UNI.) Measure your current filter and look for one similar on UNI's website.* __________________ 04 LTZ 445 95mm CP 12.78:1************ Elka stage3 front & rear Web 540-539************* JRD +3 LT A-arms 42mm Kehin*************** Burguard +1.75 swingarm Full HMF shorty *********** Hiper tech3's in Kenda klaws Dyna programable********* Lonestar axle, carrier & stem

01-25-2012, 01:26 AM	#9 (permalink)
20redfrogs :::DVX 400 Rider::: Join Date: Jul 2011 Location: Missouri/Afghanistan Posts: 963	I like K&N filters. I do run prefilters with all of them though. I clean and oil them on a regular basis. I have had no issues with them what so ever. __________________ 06 LTR 450 Mine 03 LTZ400 Wife's 04 LTZ400 Son's 04 Ozark 250 Daughter's 09 LTZ400 None of these quads are stock.

01-25-2012, 12:19 AM	#3 (permalink)
Jkolb :::Eiger Rider::: Join Date: Dec 2011 Location: Twain Harte, CA Posts: 581	I just got the quad and it had the k&n, ill go back to foam, do i need the shop to do it or can i just order the new filter and it slips on there with a clam? will I notice a lot of power loss?

01-25-2012, 12:38 AM	#5 (permalink)
sd1 :::LT250 Rider::: Join Date: Nov 2006 Posts: 799	k&n's breathe far better than foam, even with an outerwear...i always try to use k&n filters

01-25-2012, 12:40 AM	#6 (permalink)
Jkolb :::Eiger Rider::: Join Date: Dec 2011 Location: Twain Harte, CA Posts: 581	It slides onto a metal lip and a hose clamp is there to tighten it down.

01-25-2012, 01:01 AM	#8 (permalink)
Jkolb :::Eiger Rider::: Join Date: Dec 2011 Location: Twain Harte, CA Posts: 581	I love this website. Thanks guys.

01-25-2012, 01:32 AM	#10 (permalink)
KFXHELLRAISER :::DVX 400 Rider::: Join Date: Mar 2011 Location: Ky Posts: 969	I used K&N once. I used a stock replacement in a car and after a short time I noticed alot of dirt and debris in the airbox that passed the filter. Never used one again. If you want a good filter stay with a foam type and oil it correctly. I use twin-air filter's. Also had good luck with Uni's. __________________ 2k4 kFx730---Too much to list. 2k3 400ex---(Wifes)

01-25-2012, 02:22 AM	#11 (permalink)
CFM-Z440 Super Moderator Join Date: Sep 2006 Location: Southern Minnesota Posts: 6,432	K&N filters require a lot of maintenance, and it has to be done properly. I use one and you can white glove my intake any time you wish (wow that sounded gay No Homo) If you're looking for all you can get and are willing to do the maintenance, and understand how to do it properly,you will be fine with K&N. If not, use something else, but foam fails if neglected too. Where I think most of the K&N problems start is neglect. Every ricky racer out there thinks they need one, and most of them don't understand the first thing about them. Many of the rest of the issues are from guys that do service them, but don't let them dry completely before oiling them. Oil and water don't mix, so if there's one drop of water still in that filter when you oil it, that's one spot that won't filter out any dirt. If you service it exactly as they instruct, with their cleaner and their oil, and you do it often enough, you won't have problems. __________________ 03 LT-Z 470 Max Power 12.5:1 94mm Piston, Hot Rods +5 Stroker Crank, Web Cams 539 (+6) IN / 539 EX, with Hot Cams sprockets, Ferrea +1 Valves, LTZ/DRZ springs (IN)DRZ springs (EX), DRZ Manual Decomp. Ported head, FCR 41 with Noss adaptor, Home made intake, Modified HMF Full System, Home made header, Trailtech flywheel, Dyna Programable 54hp 36ft lbs

01-25-2012, 02:30 AM	#12 (permalink)
Pulido221 :::Post Whore::: Join Date: Jul 2010 Location: Fresno, Ca Posts: 2,315	K&N over here I have an FCI intake off a trx and came with a 8ply filter that comes with it from fuel customs. I went and bought an extreme k&n(same size as FCI filter) and still used the FCI outerwear and I felt a very noticeable touchy snap feeling in the Bottom end power band over the FCI filter. I recharge my k&n after EVERY ride and use outerwear from fuel customs, and I have no air box. It's all up to you and where you ride. If you do get another k&n, get an extreme k&n I've been using k&n since 2006 when I bought my quad new and rode with same stock valves until this past year. I forgot who I sold my stock jug to, but the stock valves looked so good for being 5 years old, I sent them out to the buyer just in case his valves were cupped, shot, or covered in carbon build up. Maintanance after every single ride is key, and use chevron or shell gas. They use a cleaning additive that helps keep valves clean. __________________ Houser +2 a arms ( tric trac ) ProArmor nerfs,bump,grab bar Renthal Fat Bars ( magrath ) Houser +2 antivibe steer stem Fox Podium X front shocks TCS MX rear shock ASV unbreakable levers Full Curtis Sparks exhaust Dyno jet kit/FCI intake Old style hot cams Int/Ex ITP GNCC tires +2 GForce hubs Quadtech carbon fiber hood Kfx450R Monster graphic kit 450 BBK 13.1 JE piston KB valves / DRZ springs Mild ported head by me " WEAR A DAMN HELMET "

01-25-2012, 02:33 AM	#13 (permalink)
amcf18 :::Ozark 250 rider::: Join Date: Apr 2010 Location: Quartzsite Az,/ Picton, On Posts: 275	My 2 layer foam filter has about 3/4 inch of media to trap dirt.. My k&n, about the thickness of a hair.. I can sleep a lot better with the foam on.. I run both, but the k&n with the outerware, doesn"t get far between cleanings...

01-25-2012, 06:36 AM	#14 (permalink)
fastfarmer :::Rookie Rider::: Join Date: Jan 2012 Location: Chesapeake, Va. Posts: 41	If you can see light through the filter, that means fine, powder dust will get in there..When its VERY dusty I have changed filters in one day !!Be safe is better than sorry cause it doesn't take long to ruin your engine and all performance gains are out the window... UNI __________________ 02 400ex 04 z 250 with a aftermarket old man connecting the handlebars to the seat !!!

01-25-2012, 08:10 AM	#15 (permalink)
20redfrogs :::DVX 400 Rider::: Join Date: Jul 2011 Location: Missouri/Afghanistan Posts: 963	If you can see light through your K&N, send it back! They have a lifetime warranty. __________________ 06 LTR 450 Mine 03 LTZ400 Wife's 04 LTZ400 Son's 04 Ozark 250 Daughter's 09 LTZ400 None of these quads are stock.

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