Chainsaw Repair

From my perspective those cartridge type filters are only better in the sense they have more surface are so it takes more dust to clog them up .The old flock filters did a good job it was just in time they got the flock sucked out of them ---well kind of a play on words so to speak .

For those who like K&N they make a replacement filter also that will fit most stihls. I can't remember the part number right now either but it's a little cheaper than the HD 2

The few that I have, seem to be holding up ok. I also run a prefilter on the outside like the old style filters, mine would get plug with chips and I could not get them out. The prefilter really helped.

That design of filter is similar to what automobles use only smaller in size .Fact Briggs and Stratton use something similar .

To some extent you can blow them inside to out and clear them out but only for a limited time before the element needs to be replaced .You could probabley extent the life of them by replacing the thin foam pre filter which is not that costly .Now how many people actual do that I can't say ,I'm guilty of that myself .