air filter

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hks308

Mod Ban
Jun 4, 2006
76
0
my air filter is getting pretty dirty from over time from cleaning it. i have no idea what brand i have on it now. but i was wondering what is the best air filter for a 03 rm 250?
 
A

Anssi

Member
May 20, 2001
868
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I have tried a few brands and like Twin Air the best.

BTW, how does an air filter get dirty from cleaning it?
 
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hks308

Mod Ban
Jun 4, 2006
76
0
just all the dirt and grease on it from over time. its black as ****
 
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crack rock

Member
Feb 28, 2006
51
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i think uni is the best filter but i cant use them because i use no toil and it would eat the glue holding the two pieces of foam together so i use twinair
 
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Big Bore Stroker

Member
Jun 28, 2006
94
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hks308 said:
just all the dirt and grease on it from over time. its black as ****
Click to expand...


You might want to look into getting a better air filter cleaner and or fitler oil. My filters look alomost like new when I clean them. Maybe you are trying to get to much use out of a filter. I get one new filter every year. How often are you cleaning your filter?
 
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DLHamblin

Member
May 27, 2005
268
0

Yes, I use the NoToil oil and cleaner and they look new after each cleaning (even after a year). I like you retire them after a year (as they cleaned each weekend)
 
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Big Bore Stroker

Member
Jun 28, 2006
94
0
hks308 said:
about every 3-5 hard rides.
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I clean my filters after every ride during the spring and summer months due to the dust. In the winter I may ride twice before I clean it. 3-5 rides is way to long in between cleanings in my opinion.
 
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FloGreen245

Member
Jul 25, 2006
27
0
Id get the Twin Air cleaner system w/ the 2 buckets (1 for cleaning and 1 for oil). That stuff works great. I've always had good luck with Twin Air filters and UNI... both work good, but Twin Air is the one I use. Also, it depends on the conditions for how often you change your filter. If there's no dust and no extreme mud, I change it every couple of rides. If there's sand / dust / water change it after EVERY ride. You can visually inspect it to see how dirty it is.
 
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DLHamblin

Member
May 27, 2005
268
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True; in the fall/spring I can go several rides. This summer has been dry (after a wet spring) and the dust clogs the filter after an afternoon. I have even taken extra filters when we go in case I need to change while there.
 

trial_07

Play with gravity
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Apr 26, 2004
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I use paint thiner (Varsol) and then dish soap.

BTW are TwinAir filters double layer like UNI? Why do you guys prefer TwinAir from UNI?
 
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hks308

Mod Ban
Jun 4, 2006
76
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so this paint thiner called varsol?, gets all the dirt and everything off the filter?
 
D

DLHamblin

Member
May 27, 2005
268
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hks308 said:
what do you use to clean them off?
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If you use the Notoil system; it comes with its own cleaner. Mix in with warm water in a bucket (you could use your washing machine but I don't...) and wash by hand. Rinse in another bucket of warm water and once dry re-oil.

There is no solvent in the cleanser so its not hard on the glue or foam. I have heard some people say the oil makes the glue on UNI filters come loose after awhile but I have no personal experience with UNI filters to say.
 

trial_07

Play with gravity
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Apr 26, 2004
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hks308 said:
so this paint thiner called varsol?, gets all the dirt and everything off the filter?
Click to expand...

It gets all the dirt, oil, and grease off in no time; probably the best thing I tried so far and it's really cheap (like 7 bucks at Canadian Tire, you could also find it at Wal Mart I guess). Plus, it causes no damage to the filter.
 
C

CHR!S

Member
Jun 30, 2006
293
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crack rock said:
i think uni is the best filter but i cant use them because i use no toil and it would eat the glue holding the two pieces of foam together so i use twinair
Click to expand...

thats funny, i have a uni and the two stages are seperable
 

trial_07

Play with gravity
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Apr 26, 2004
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Me too! Both are seperate conected only by the blue plastic thing in the middle.
 
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snb73

Member
Nov 30, 2003
770
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hks308,

NOTOIL is a vegitable based oil that dosn't require solvents. http://www.notoil.com/

I use TWINAIR's filter and oil, here's how I clean mine.

Clean the filter in your choice of solvent to remove the old oil and dirt it trapped. I use gasoline. I prefer using a small bucket with enough solvent to submerge the filter. Knead the filter a few times, sqeeze out the excess, dump the dirty stuff. (it's great for killing weeds growing in the driveway cracks) Repeat 3-4 times or until the solvent remains clear, and you can't feel any dirt in the bottom of the bucket.

Wash the filter in warm soapy water. I use dishwashing liquid. (dawn, joy ect...) Use the same bucket and method as with the solvent, just use warm soapy water. Repeat 3-4 times, sqeezing the filter and dumping the dirty water each time.

Rinse in warm water. Same method. Dump the dirty water each time. Repeat until the soap bubbles are gone. Their shouldn't be any dirt particles in the bottom of the bucket.

If the dirt is really imbedded in the filter I use the garden hose or the kitchen sink sprayer to remove it. Spraying from the inside of the filter, the water pressure pushes the dirt out the way it came in. I hold the nossle right up against the filter. Gentle pinching and kneading will get it all out.

Once the filter is clean, I spin dry (no water) it in the washing machine. Set the filter so the centrifigle force pulls from the inside out. (have the side that faces your carb, face the center of the washing machine) If the filter won't sit still, I prop it with a clean shop towel. It should be dry in a few hours after that.

Before oiling, I turn the filter inside out to see if I missed any dirt. "Plucking it" with your finger almost always removes it.

Don some latex gloves (found at home depot in the paint section). Place the filter in a clean bucket, pour the filter oil all over it. I use an 8X8 inch plastic bucket with a lid. Saturate it with your favorite oil, sqeeze out the excess and install. I don't grease the rim. You will have alot of oil left in the bucket. It's clean, so pour it back into the filter oil can to use next time. I use Twin Air filter oil.

This method only takes about 15 minutes, minus drying time of course. I clean my filter about once a week. I've used this method for a year and a half with no adverse effects to the Twin Air filter.

Hope this helps, Steve.
 

trial_07

Play with gravity
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Apr 26, 2004
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One thing though, I don't think gasoline is very good for the filter. Like I said, use Varsol (cheaper, works better, not as hard for the filter as gas).

BTW good explanations!
 
S

snb73

Member
Nov 30, 2003
770
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As a side note..... I Just purchased a 2004 CRF250 for my son, after a week of riding the filter needed cleaning. The bike has the stock filter from honda. I have a little Twin Air filter oil left and wanted to use it up before purchasing the NoToil system. I cleaned his filter the same way I clean my stock suzuki and twin air filters, using unleaded gas as the solvent. After 2 cleaning cycles, the gas ate away the glue and the filter fell apart at the seams. With a ride planned the next day and no MX stores open, I was in a pickle.

I went to my local all night parts store; autozone, advance, pepboys ect... and purchased Permatex brand Super Weatherstrip Adhesive, item#80638, for $2.87. Following the instructions, I glued the filter back together. The job came out perfect, you can't even tell the filter had been reglued.

So for $2.87, the boy and I rode the next day. Needless to say, NoToil and a new filter were purchased on monday.

Steve
 
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