Among serious Off Road Dirt riders K&N filters are not universally respected AT ALL. Many NEGATIVE documented results using K&N in very dusty conditions.
Not Good ... and I know of no one who knows what they're doing who uses a K&N air filter for serious dirt riding in severe dust.
Fact is: K&N filters let dust enter on some configurations.
I wonder if the K&N is the only option for F650 BMW's to the OEM paper air filter used? Surly, someone must make a simple Foam filter for these bikes?
So much better, simpler... and much less money.
BUT ... if the K&N is the ONLY option to paper, then there is a solution for it. You use a slip over cover with it to help catch dirt. A sort of Pre filter. Also, seal contact surfaces with grease to ensure no dust enters.
The slip over cover will need frequent cleaning in very dusty conditions (like group rides), so be aware of that fact.
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