SkippyKtm
The Lorax, my FIL rip...
otstir:otstir:otstir:
I've seen this twice from 2 different users so far, so I'm starting to think that the HD2 isn't exactly what its cracked up to be. Although it may provide better filtration of the smallest particles, it appears to not last nearly as long as the original HD filter.
This filter came from a logger's MS660 which is about 11 months old and has quite a few hours on it. The saw is in good enough shape that I think it will last him for another year assuming he takes better care of it. The milling marks on the exhaust side of the piston are still there, but on the intake side they are gone. The nikasil on the cylinder has a mottled appearance on the intake side as well, I didn't get photos of that though. I believe we caught it in time, and I educated him to always check the spitback cage and look down the carb throat to check for fines.
Its important to remember that most loggers look at a chainsaw like its a tool rather than a toy. All they expect from it is to get as much work done possible with the least cost. So that the fact the HD2 has better filtration doesn't matter if they have to replace it all the time.
We installed a new Standard HD filter and the HD2 will go in the trash. I wonder if Stihl had designed the HD2 filter so that you must change them more often, that way the can fatten up their bottom line. I'm sure the HD2 filter is big bucks, but are they worth it? I think not, not a least if you're a logger or someone who racks up the hours anyway.