I have always run several pairs of the older style Maruyama hedge trimmers, I have found from the units I have owned the Mars to be the best so far. A distributor in my area quit selling them and I got a real good deal on a bunch of stuff and I am having problems with the carbs on the new motors. These are 2009 California compliant, the motors run great for about a month then all of them have started the bog blues. I run 93 octane and Star Tron fuel additive but the carbs or something is having problems in a months time. The nearest dealer is 40 miles away for warranty work so I am on my own, I am wondering how hard it is to adapt a different carb to some of these products. How interchangeable are some of these units? Any help would be great.