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Old 04-14-2011, 08:25 PM   #1
Frogrider
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Default Hey you! Clean your air filter!

There are 3 things you must do very frequently to your KLR.

Put gas in it, chek the oil, and clean the air filter.

I started noticing a slight hesitation on the throttle today and....
I see there are many new owners on the forum since it is now spring
and thought it appropriate to start a thread on the basic task of
cleaning the filter. My filter of choice is the UNI aftermarket filter but
cleaning the stocker is pretty much the same.

Here is my UNI and airbox cover after 400 miles of on/off road about
50/50. Georgia dirt roads are a mix of clay and sand, hard and soft.
no water or mud this time.



Now here is the inside of the airbox, which is accessed on the right
ide of the bike under the rear side panel.




It doesn't take long to get like this in dirty dusty conditions.


I wiped this from the bottom of the airbox, my snorkle is still intact!




The screen is intact as it always will be on MY bike, clean too! This is
downstream of the UNI filter!





Inside the UNI filter prior to cleaning. The UNI really keeps the dirt
out but allows air flow!




More to come...........I am cleaning the filter and servicing it with the
K&N kit which includes the cleaner and spray. It works and I already have it!
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Old 04-14-2011, 08:48 PM   #2
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Default Re: Hey you! Clean your air filter!

OK...inside the clean air-box. I sprayed inside carefully with the K&N
cleaner and wiped out with a dry towel after letting it soak a bit. and
wiped, ane wiped, and wiped......Make sure the little hole in the
bottom of the airbox is not clogged. This allows water to escape if it
should enter the airbox.





Here is the filter after cleaning. All ya do is spray the filter down with
the cleaner and allow to soak for 15 minutes or so. Then you pull out
the garden hose and spray her down hard untill clean. I then dry
thoroughly with a dry towel and then allow to air dry completely.




Next spray the filter with a light coating of oil, some folks use 30 wt
motor oil. I use the K&N spray filter oil. UNI also makes a spray oil
for this. wipe off the excess. and install the filter snug.





Next I use the K&N tube grease to lube the cover seal, this helps to
keep water out of the airbox on some of those deep water crossings.
This stuff is thick and will definately seal the cover to the box. Make
sure to put a solid bead on the seam and wipe around with your
finger.




Finally place the cover on the box, replace the side cover and RIDE!!!!


This seems very basic and easy and it is but many DS riders fail to
clean the filter regularly and then are curious about surging throttle,
inconsistent acceleration, poor idling, poor duel mileage, etc. etc.
etc. Remember that the more you ride off road, the more you must
clean it.
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Old 04-14-2011, 09:22 PM   #3
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Default Re: Hey you! Clean your air filter!

awesome, thanks!
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Old 04-14-2011, 09:39 PM   #4
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Default Re: Hey you! Clean your air filter!

I don't know about the rest of you but I think that screen and filter boss nut looks dirty.

My 08 was bad from new riding dirt roads, would only take a few hundred km of dirt to be filthy untill I added some baffling, now I can do a 2000km and its still looking alright.

But yeah clean and oil that air filter. Most top end rebuilds I do are from poor air filter service, or k&n products. Allot of people clean and not oil there air filters, or wait until there are runnability issues before brining it in for service.

Though most of my customers are bringing a unit in for 500hour first service, and then again at 1000 hour rebuild......
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Old 04-14-2011, 10:14 PM   #5
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Default Re: Hey you! Clean your air filter!

Quote:
Next I use the K&N tube grease to lube the cover seal, this helps to
keep water out of the airbox on some of those deep water crossings.
This stuff is thick and will definately seal the cover to the box. Make
sure to put a solid bead on the seam and wipe around with your
finger.
Noob question - Is the K&N tube grease applied over the foam gasket on the air box cover?
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Old 04-15-2011, 09:13 AM   #6
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Default Re: Hey you! Clean your air filter!

That is what it looks like he is doing to help keep water out of the airbox on deep water crossings. I personally do not like getting into water that deep!

I also learned (years back when I was first shown how to clean a filter) that it is a good idea to put a thin bead of grease around the air filter edge where it sits up against the air box. This ensure no big particles can find their way through and closes off any gaps should the filter not quite be positioned right.

The grease will also tend to trap any large particles that get around that sealing edge as well and when you go to clean it you can see how the grease "catches" them.

It does take a little longer to clean and install when adding this step but the results of a happy engine not ingesting any contaminants are well worth it.

A few years back we had a real bad drought (kind of like this year) and on a weekend ride on real dusty roads up to Colorado and back my air filter got so clogged that about 100 miles from home the motor would not run over about 3500- 4000 rpm due to dust clogging it up. I now use a filter skin over it because if this happens you can pop the air box cover, pull the filter skin off, and it is like having an instantly newly oiled and cleaned filter in about 3-4 minutes.

I punch a hole in the filter skin for the mounting stud when installing over the filter, and wrap the edge in about 1/3 of the way between the filter and airbox to hold it in place. Then when I go to pull the filter skin off I just let it hang there where the mounting stud goes through it till I re-clean the whole shootin' match.

It is a simple little trick that extends each cleaning of the filter by about 100 percent!
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Old 04-15-2011, 09:37 AM   #7
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Default Re: Hey you! Clean your air filter!

My name is Backwoods, and I approve this thread!!!



I also do the grease around the lip of the filter where it contacts the housing...
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Old 04-15-2011, 05:18 PM   #8
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Default Re: Hey you! Clean your air filter!

Quote:
Originally Posted by John0270 View Post
I don't know about the rest of you but I think that screen and filter boss nut looks dirty.

Yep you are prolly right. When I ran the K&N filter and it ran like crap it was most likely the culprit.
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Old 04-15-2011, 05:21 PM   #9
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Default Re: Hey you! Clean your air filter!

Quote:
Originally Posted by prybar View Post
Noob question - Is the K&N tube grease applied over the foam gasket on the air box cover?
Yes, it also helps keep water out when riding in a toad strangler, like that Saturday in January 2010 when I left TDA and rode to Tallahassee on I-10 and wished I had some of those Mercedez Benz headlight windsheild wipers on my face sheild.....
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Old 04-15-2011, 05:22 PM   #10
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Default Re: Hey you! Clean your air filter!

Quote:
Originally Posted by dvgonzo View Post
That is what it looks like he is doing to help keep water out of the airbox on deep water crossings. I personally do not like getting into water that deep!

I also learned (years back when I was first shown how to clean a filter) that it is a good idea to put a thin bead of grease around the air filter edge where it sits up against the air box. This ensure no big particles can find their way through and closes off any gaps should the filter not quite be positioned right.

The grease will also tend to trap any large particles that get around that sealing edge as well and when you go to clean it you can see how the grease "catches" them.

It does take a little longer to clean and install when adding this step but the results of a happy engine not ingesting any contaminants are well worth it.

A few years back we had a real bad drought (kind of like this year) and on a weekend ride on real dusty roads up to Colorado and back my air filter got so clogged that about 100 miles from home the motor would not run over about 3500- 4000 rpm due to dust clogging it up. I now use a filter skin over it because if this happens you can pop the air box cover, pull the filter skin off, and it is like having an instantly newly oiled and cleaned filter in about 3-4 minutes.

I punch a hole in the filter skin for the mounting stud when installing over the filter, and wrap the edge in about 1/3 of the way between the filter and airbox to hold it in place. Then when I go to pull the filter skin off I just let it hang there where the mounting stud goes through it till I re-clean the whole shootin' match.

It is a simple little trick that extends each cleaning of the filter by about 100 percent!
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1999 KLR 250 - Teal?
2008 KLR 650 - Green
2001 Kawasaki ZG 1000 Concours - Black
"Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing." Helen Keller
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Old 04-15-2011, 05:43 PM   #11
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Default Re: Hey you! Clean your air filter!

nice write up Frogrider...it is now "stuck"...maybe more folks will heed your advice...

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Old 04-16-2011, 08:21 AM   #12
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Default Re: Hey you! Clean your air filter!

cleaning mine today
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Old 04-16-2011, 02:08 PM   #13
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Default Re: Hey you! Clean your air filter!

Cleaning mine as well.
Air filter skins,never heard of them, how expensive, where do you get'em?
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Old 04-16-2011, 03:40 PM   #14
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Default Re: Hey you! Clean your air filter!

I spray warm water from the clean side towards the dirty side to push the dirt out. Use simple green degreaser as the cleaner.
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Old 04-17-2011, 02:40 AM   #15
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Default Re: Hey you! Clean your air filter!

Nice job brother! Thank you!
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Old 04-17-2011, 07:35 AM   #16
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Default Re: Hey you! Clean your air filter!

I had seen and used Filter Skins years back while pit crewing for a buddy on mini sprint race cars. We used them as the dirt tracks always dried out and got dusty. Because there are always so many other things you NEED to do between races changing the air filter out for a clean one took time away from the "other" duties so using a skin was super fast and easy!

You can get them several places but the cheapest place I found them was here:

http://pcracingusa.com/store/product...roducts_id=117

When I purchased mine several years back there were three in the bag, it looks like there still are (from the picture) so it is a pretty good deal!

You oil them up just like a filter and they do make a little string pull affair so you can pull them off without even opening up the airbox. It is purchased seperate though.

I prefer to open up the airbox and watch as I pull the skin off to make sure it does not pull the real air filter seal/lip away from the airbox housing cause I am so annal about keeping EVERYTHING but air out of the intake!

Last edited by dvgonzo; 04-17-2011 at 07:38 AM. Reason: missin' leters
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Old 04-17-2011, 01:53 PM   #17
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Default Re: Hey you! Clean your air filter!

What model number "skin" or filter did you purchase?
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Old 04-18-2011, 09:02 AM   #18
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Default Re: Hey you! Clean your air filter!

That PC1364 (the one that link I posted takes you too) is the one for the KLR650. Fits like a glove!
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Old 04-19-2011, 04:40 PM   #19
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Default Re: Hey you! Clean your air filter!

Thanks
Now one more question kinda dumb but lotsa questions are if you know the answer.
I just bought a uni-flo air filter and a no-toil recharge kit, do you know if the chemicals
are compatible with the uni filter, should it make a difference? The Kaw Shop was telling
me that uni must use a uni kit etc. and the person who sold me the no-toil told me
once I use no-toil I must stay with no-toil, chemical interactions etc. this almost
makes sense, just almost but doubtful ring to it. They are all trying to sell me something
and I sure would like to know the bottom line for these bio-degradable recharge kits?
Are they apples n apples or do they throw in an occasional lemon?


Thanks
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Old 04-19-2011, 05:48 PM   #20
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Default Re: Hey you! Clean your air filter!

Hey Stinker,
I don't know 4 shore but I use the K&N recharge kit with my UNI
and it seems to work fine. I have cleaned it 2 times and re-oiled it
with no issues.
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