fordf150
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Lots of time spent working on the old lean burn chryslers and such says that there are going to be lots of instances that a mtronic/autotune isnt going to run perfect. those old electronic controlled carbs ran great 95% of the time but there is a limit as to what they were able to tune out. chainsaws are in some ways much more finicky than a 4 stroke engine. mtronic is a much simpler design with less inputs and outputs. my money says a standard carb and coil would solve every running issue these saws have and at the same time sacrifice very little if any performance.I'm currently chasing both paths of making the MTronic work like it should and making a standard adjustable carb version. I believe there are a lot of "old school" guys out there that would really appreciate the opportunity to have a standard carb on their new 661. Time will tell how this will work out. I have a friend in Germany that is installing the non-MTronic carb an coil on his ported 661C. He's been experiencing the same symptoms. There are others as well on both ported and stock saws. Is MTronic at fault? I don't know that yet, but I sure aim to find out. It's the least I can do for my customers.