Foam filter

[Bike Tart]

Installed a unifilter foam filter a month ago, since then have done about 500ks on dry dirt roads like these.

The filter comes with a pre-filter that fits over the air intake snorkel as below.

The main filter looks like this.

After washing the filters I found 90% of the dirt was caught by the first filter and none got into the air box. Definately a good thing for those doing dusty roads.

Check it out.

Unifilter in Oz.

 

[harry]

foam filters

Hi Bike Tart
What exhaust system you using? Any probswith fueling? Running lean etc?
harry

 

[aspad]

Hi there,
Put on the same system myself and had similarly good results.
Here is the post with a couple of other pictures.



I have not noticed any drop off in performance and have actually kept the pre-filter on all the time.

Am having my 10k service next week so i guess I might put the old paper one back on and get a clean spare (do bwm approve of foam filters by the way or could they argue that they void the warranty?).

Bogong high plains in the picture BT?

 

[Bike Tart]

Harry,

I am using the standard exhaust and no obvious problems with lean/rich running. I believe the EFI would deal with this issue. Subjectively I recon' there is slightly more bottom end tourque and maybe it spins up a little quicker. (could be wishful thinking on my part).

 

[Rod]

I heard that if you use a K & N filter, that it affects your warrenty...........

 

[Bike Tart]

Spoke to me dealer (bike that is) about the warranty issue, he reconds no problems as long as there is no evidence of dust entering the motor. If in doubt slip the original in prior to service.

We are planning a trip into outback aussie in July which will kill a standard paper filter (especially if fall over during river crossing), so need a foam filter. I imagine BMW expect some riders to do this and are cool with it.

 

[harry]

Bike T
Thanks for that
harry