How often do you clean your K&N Filter?
 

I have just recently purchased K&N's for my twin titan, which also has outer pre-filters.

It is of this matter that I would like to inquire of how often you clean you K&N's since dirt is not visible in the filters.

RE: How often do you clean your K&N Filter?
 

I don't use K&N on my R/C, but I do use them on my 4-wheelers and automobiles, and dirt definatly does become visible on them. You are using pre-filters, and if you can't see dirt on the K&N, then it's probably still clean.