coastie said:
Here we go! ::002:: But I'm still going to watch ::017::
Yep. The one trick to using K&N filters is to frequently reoil them from the inside and don't clean until you can't see the pleats anymore. I've used them since the late sixties, but they will let really fine particles through, especially when new and clean. Once they have a nice coating of dirt on them, they tend to work pretty good, if you periodically reoil from the inside. Ia ran them on two stroke dirt bikes in a lot of places, including the fine red dust of Western Australia, but always oiled the snot out of them. Since the engines lasted longer than expected under the conditions ( 35-38K miles out of a crankshaft for a very heavily used DT3 good enough?) I decided it was good enough. I'm sure they let some dirt through, and if I lived in a very dry place with very fine dust, I'd probably avoid them. But I don't, so it is a moot point. Around here, I'd certainly use one, and even on the local fine-dust stone roads. The one thing I really do like about them is you can install one, re-oil periodically, and then throw it away when you overhaul the engine, without ever cleaning it. They flow a bunch of air, even when caked, mostly because of the pleated design with the large surface area. Foam ones require frequent cleaning, and once the dirt gets embedded enough, they should be tossed. Paper works quite well, you just need to change them from time to time.
But do whatever you feel you're comfortable with.
