I recently went from the original screen/mesh to custom made K&M filters and had to retune the engine as they restricted air flow. I now have the throttleblades open further at idle and that changes quite a bit of things as far as a carb is concerned. I'm think about switching back but waiting for warmer weather as that will affect things as well.
I just love them little flying saucer air cleaners, they're the tits!
