Hi Since I have not been through a winter with my wood stove yet in Michigan, and since I have been funding everything (stove, chimney, chainsaw, splitting axes etc) this year, I decided to get a relatively lightweight chainsaw "for starters". Now I have to say that off the bat, this chainsaw works out pretty good for me and I like its light weight. By the time I run out of gas I generally need a break (and typically have to swat a few thousand mosquitos that have been feeding off me while I have been busy. One of the problems I have found though, it that apparently the air filter is hopelessly undersized on this unit. It is a single (flat) layer membrane type filter. It is not pleated in any way, which would increase the surface area for contaminants. After a few days use from new, I found that the unit lost a lot of power and was "four stroking" all of the time and wouldn't idle. So in looking for the problem, I came upon the air filter. The pictures below show what it looks like: http://www.flickr.com/photos/11828061@N04/sets/72157602200288785/ Basically, the surface area of the filter element is so small and restrictive, that the sawdust that is able to reach the filter while cutting through an 8" round is sufficient to create a noticible loss of performance. Once the filter has been clogged a few times, it appears that all attempts to clean it are only partially effective and performance drops off after just a few minutes of use. Has anyone experienced this problem ? Are there any replacement filter with larger pleated elements ? Perhaps replacing the entire airbox ? Other than this issue I think the saw works just fine, but this appears to be a major design flaw.