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Old 09-18-2009, 04:55 AM   #1
mtm100 OP
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F800 Air Filter

Has anyone replaced the OEM? I've been riding in a lot of very fine dust.
My dirt bikes of the past all has a oiled foam air filters. Wouldn't that be better than the OEM? Any foam air filters for the F800?

Thanks,
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Old 09-18-2009, 06:43 AM   #2
Bucko
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Paper, please

Somewhere, I think in the bowels of the original F800GS threadfest, someone found a Uni filter that fits the GS8. Pretty sure you'll find that the paper filters will keep the fines out of your motor just, uh, fine. Just ask Bob: http://www.bobistheoilguy.com/airfilter/airtest3.htm.

Oiled foam filters are cheaper in the long run because you can clean and re-use them, but the OEM paper filter isn't so big you can't carry a spare on an extended trip. I just did hundreds of dusty miles and my bike is running fine. I'll check the air filter today when I change the oil.
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Old 09-18-2009, 09:35 AM   #3
mtm100 OP
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Quote:
Originally Posted by Bucko
Somewhere, I think in the bowels of the original F800GS threadfest, someone found a Uni filter that fits the GS8. Pretty sure you'll find that the paper filters will keep the fines out of your motor just, uh, fine. Just ask Bob: http://www.bobistheoilguy.com/airfilter/airtest3.htm.

Oiled foam filters are cheaper in the long run because you can clean and re-use them, but the OEM paper filter isn't so big you can't carry a spare on an extended trip. I just did hundreds of dusty miles and my bike is running fine. I'll check the air filter today when I change the oil.
I'll check that thread. Thanks
I'll be interested to hear what you see.

Thanks,
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Old 09-18-2009, 01:45 PM   #4
EnderTheX
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I read it entirely and to sum it up for our viewers who are short on time his basic conclusions include: (this is for a Miata not a F800GS)

- Paper OEM filers do not restrict flow too much and are easier to replace than servicing foam/oil based filters (like K&N)

- K&N filter does not pass as much dirt by as people think and is comparable to average paper filters.

- K&N also does not pass oil (which may damage sensors), it passes dirt.


Test method: Installing a secondary paper filter to collect particles behind the test sample filters and running 500 miles.

I've got a K&N on my SV650SF and when I am servicing my F800GS I may stick one in too. I like K&N and I don't mind servicing them. I also don't believe they reduce engine life. Also... BMW should not be able to refuse warranty claims because you install a different filter, as far as I know it is on the manufacturer to PROVE the customer modifications/actions caused the failure if they want to refuse warranty (per the US government).
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Old 09-18-2009, 02:20 PM   #5
Bobo1167
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oh this is gonna be fun

Enderthex you've started another K&N thread, don't ya know that's like taunting starving wolves with raw meat?

I too will soon start destroying my engine with that air filter, whenever I can get one. As of just now, their site doesn't list any air filter, only oil.

Maybe you've found different? Like the 12gs filter is the same?

Start the carnage, I predict 20 pages before the sun comes up again.

bobo
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Old 09-18-2009, 04:57 PM   #6
Bigem
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I recently installed a UniFilter kit into my F8. As I was pushed for time I did not get around to installing the pre-filters(will do over the next week), so to get around that I cut and installed a cut to size domestic "Chux" wipebetween the main airfilter snorkal and unifilter.

After 3000klm, including about 1200klm of dirt, the unifilter had evidence of dust but none had ingressed into the airbox. I had the same set-up on my F659 Dakar and it worked just fine and engine protection was not a concern.

The Unifilter kit number is : NU-7305KIT and comes with everything you need and instructions. Less than $80AUD.
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Old 09-18-2009, 08:30 PM   #7
YetiGS
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Quote:
Originally Posted by Bigem
I recently installed a UniFilter kit into my F8. As I was pushed for time I did not get around to installing the pre-filters(will do over the next week), so to get around that I cut and installed a cut to size domestic "Chux" wipebetween the main airfilter snorkal and unifilter.

After 3000klm, including about 1200klm of dirt, the unifilter had evidence of dust but none had ingressed into the airbox. I had the same set-up on my F659 Dakar and it worked just fine and engine protection was not a concern.

The Unifilter kit number is : NU-7305KIT and comes with everything you need and instructions. Less than $80AUD.
I wonder if we can get that here in the US? I've always run Uni filters on my dirt bikes...
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Old 09-18-2009, 08:49 PM   #8
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Im using a washable BMC filter for an ST, it woks ok but its a bit of a pain to clean and could probably do with some sort of pre filter. but for the 40 bucks its cheaper than replacing paper ones.

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Old 09-19-2009, 07:15 AM   #9
cbOwl
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K&N part # BM-8006 fits. Cost $40. Just installed it.
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Old 09-19-2009, 07:31 AM   #10
Ducksbane
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Thumb I have a Unifilter as well

I've had a unifilter for a while and did do the modification so you can run the prefilters.

After riding another standard 800 I really do think you get more power and better throttle response, especially around 3,000 to 4,000 rpm.

Should be cheaper to maintain, and is far more waterproof than standard.

What's not to like?

If Unifilter in America doesn't have them, you can always mail order over the internet.
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Old 09-19-2009, 12:24 PM   #11
The Griz
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+1 on K&N BM-8006! Had it in for quite a while now. No issues, only more power!
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Old 09-19-2009, 05:09 PM   #12
DolphinJohn
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Wunderlich has a Blue filter made by Green filters, or something like that.

I have it and like it.
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Old 09-20-2009, 05:06 PM   #13
1P8RIOT
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F800 DEPOT Has K&N on page 19 of their online parts cat. $42
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Old 09-20-2009, 05:51 PM   #14
DolphinJohn
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I paid twice that for the Wunderlich, so it must be twice as good.
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Old 09-20-2009, 06:54 PM   #15
EnderTheX
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Quote:
Originally Posted by cbOwl
K&N part # BM-8006 fits. Cost $40. Just installed it.
Thanks!! I will be putting that on as soon as my stock filter looks crappy. I don't believe K&N gives a noticeable amount of power but I like the clean ability and longevity of their filters .
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