I just got an 028WB in and everything seems to be fine on the saw, the only problem I have is I can't seem to get the air cover to come off of the saw. It's the older style with the screw not the twist lock, when I back the screw out (looks more like a nut) I'm guessing that it threads onto a bolt coming out of the carb but not sure. I think that whatever it connects to is backing out with it but will not come all the way out to let the cover come off, Has anyone had this problem with the older style and is there a trick to get it off? The saw seems to have good compression I can pick it up by the start cord and it slowly will go down but it has to fight the compression to do so, the sprocket and bar are hammered but I'm wanting to put a rim spocket on it anyway, local dealer said I had to have a conversion for it, says the bar cover has to be replaced in order to use a rim sprocket the package (cover, spocket, rim and so on) will be $56.