Re: K & N - thankfully they work.
Pinholes certainly aren't good!
I have no idea how large a pinhole hole is acceptable, but there has to be some way the air gets through.
I haven't run them that long. I rotate between 2 of them, and clean them when they look yukky! Sometimes that's only a few weeks, even only a thousand miles or so.
I'm wondering if a new one looks the same way, or over time the fabric stretched and separated - like an old pair of jeans? I haven't seen mine like that. Light gets through like a paper filter, but not pinholes.
The important thing is - how was the ducting, carb or TB - dirty, dusty, or clean?
I'm not following the instructions totally either.
I probably over-oil it.
Dirt collects on the element, if that dirt is oily it will help catch more dirt. So every once in a while I shoot a little more oil on the dirt on the outside.
Eventually it builds up so much it's bound to be getting restrictive, so I clean or swap it out.
I would think the time when it's doing the least amount of cleaning is when it's totally clean.
I'd love to find a real centrifugal filter (not one of the phoney ones around) to use in combination with the K&N. Anybody know of one?