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Old 09-01-2014, 10:13 AM   #1
GrahamM OP
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Uni foam filter?

I am wondering your experience with uni foam filter on airheads.

I am not too keen on paper in water areas and high dust with off road riding so I picked up a Uni foam filter to give it a go, using PJ foam filter oil tacky spray on top side.

Just installed, it was around $30.00 and reusable with a solvent wash and rinse.

Anyone have good or bad experiences with this arrangement?

This is for my r80g/s
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Old 09-01-2014, 10:23 AM   #2
jackd
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I've been using a Uni Foam filter in my R100GS for the last several years with no real issues. I have been doing dusty fire road riding in previous years and I think these filters do the job. There's never any dust residue in my intake tract when I go in there.
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Old 09-01-2014, 11:22 AM   #3
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Foam is a great filter IF you service them. Every single airhead I have ever serviced with a foam filter had a filter than needed to cleaned and oiled a long time before I got there. They don't filter much at all dry. I have a lot of experience with foam filters in dirt bikes. I don't want to mess with my filter that much in a street bike. I use K+N with great results. They filter much better than paper. Yes, I know there are a number of 'scientific' tests that prove K+N's don't filter as well as paper but I have serviced a lot of airheads and from what I see with my own eyes K+N's filter much better. That's why I mention them. I have around 140,000 miles experience with K+N's myself in airheads. Great filters.
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Old 09-01-2014, 12:14 PM   #4
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I'm happy with mine. I ride off-road more than on and my friend loves to make me eat dust on his stupid orange bike. I do clean it regularly, but that's part of the deal.
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Old 09-01-2014, 12:28 PM   #5
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I like my UNI filter (KLR) but be sure to use the correct cleaner for the filter, some are not compatible and will dissolve the glue used in the filter construction.
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Old 09-01-2014, 12:37 PM   #6
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I had one on my bike for 15k.
The biggest problem was that it leaked between the air box and the filter it self. I found a lot of dirt in the air box even with the filter proper oiled.

If you would like one send them a good original filter and let them make the foam inside the stock plastic outside.

On my ST I replaced the filter for an oiled cotton one just like a K&N which filters better than my Uni filter(when oiled ok)

Another thing I had with the foam was that lots of water washed the dirt trough the foam which it didn't do with my DNA filter.
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Old 09-01-2014, 01:49 PM   #7
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To Prutser's comment, I do grease the edge of the filter where it meets the airbox. And, he thinks his bike is a U-boat!
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Old 09-01-2014, 01:58 PM   #8
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I'm pretty happy with my Uni Filter. They do a good job. But they do need pretty regular servicing. I use 'No Toil' cleaners & filter opil which makes the cleaning reasonably painless.

I think Phreaky Phil has his Uni Filter set up with pre-filters, & that makes them even better. I need to investigate doing that myself.
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Old 09-01-2014, 02:12 PM   #9
Prutser
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Quote:
Originally Posted by chollo9 View Post
To Prutser's comment, I do grease the edge of the filter where it meets the airbox. And, he thinks his bike is a U-boat!
The edge of my uni filter was to soft. The rubber was so flexible that it was sucked into the air box.

For the rest I think they work fine...most of the time

I did find a way to seal the edges. Just used an old stock filter and mounted the uni filter on the top.
That way it sealed really good but you need to lengthen the spring clips that hold the top cover.
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Old 09-01-2014, 09:57 PM   #10
supershaft
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Quote:
Originally Posted by Prutser View Post
The edge of my uni filter was to soft. The rubber was so flexible that it was sucked into the air box.

For the rest I think they work fine...most of the time

I did find a way to seal the edges. Just used an old stock filter and mounted the uni filter on the top.
That way it sealed really good but you need to lengthen the spring clips that hold the top cover.
I just figured all the dirt I saw in the airboxes I serviced with Uni Foam filters was for the filter being bone dry but . . . .

That's another reason why I like K+N's. If you modify the filter body to fit right, the filter body seals real good against the box. It's made out of about the perfect stuff I guess. Soft but not too soft rubber.

What I don't understand is how the stock filters let all the dirt in? Bikes I service with off road miles and stock filters have air boxes full of big chunks of whatever in there. I have seen that play out many times over.
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Old 09-01-2014, 10:47 PM   #11
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Quote:
Originally Posted by supershaft View Post
I just figured all the dirt I saw in the airboxes I serviced with Uni Foam filters was for the filter being bone dry but . . . .

That's another reason why I like K+N's. If you modify the filter body to fit right, the filter body seals real good against the box. It's made out of about the perfect stuff I guess. Soft but not too soft rubber.

What I don't understand is how the stock filters let all the dirt in? Bikes I service with off road miles and stock filters have air boxes full of big chunks of whatever in there. I have seen that play out many times over.

The paper filters When a bit dirty start pulling the dirt right through. I have sealed the filters around the edges for customers with grease and at the next service the grease sealed but the paper allowed a lot of dust downstream.
Oiled fabric and foam filters were developed for desert racing where dust was killing bikes with paper filters.
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Old 09-01-2014, 10:52 PM   #12
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Be careful with No toil cleaners and UNI, sometimes there can be disastrous results.
There are a couple threads discussing this issue.
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Old 09-02-2014, 05:26 AM   #13
GrahamM OP
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So it seems there is good results IF the filter is maintained.

I ride mostly offroad with the Berg and KTM so I am very familiar with maintaining foam filters... I also greased the bottom of the filter for max sealing. One area for improvement they could make is the top interface, the top side seems too soft and the middle gets suck in when the clips are apply, careful installation makes it even. This does not affect the filtering, just a PITA for installation.

Thanks for the input, all very helpful.
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Old 09-02-2014, 12:10 PM   #14
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Quote:
Originally Posted by robtg View Post
The paper filters When a bit dirty start pulling the dirt right through. I have sealed the filters around the edges for customers with grease and at the next service the grease sealed but the paper allowed a lot of dust downstream.
Oiled fabric and foam filters were developed for desert racing where dust was killing bikes with paper filters.
AFAIAC, riding on the street has too much dust involved for paper filters.
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Old 09-02-2014, 01:26 PM   #15
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In my experience, tacky oils shouldn't be used on Uni or any other foam filter. I know firsthand that K & N filter "oil" will clog Unifoam. Makes the filter act much like a mechanical choke. I use regular motor oil on most foam filters squeezing the excess out to get it saturated just right. And naturally K&N spray "oil" on the K&N on my airhead. Which reminds me, its about time to inspect, clean, and repspray that filter.

I have experimented with a sheet of Unifoam cut to fit right over the top the K&N in the airhead after reading some of the bad press about K&N filtering ability. I eventually pulled it back out and set it aside. Never really found any dust or dirt on it when I pulled it after a couple thousand miles.
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