MCW
Somebody's talking crap here & it ain't the tree!
funny you say no m tronic i talked to the stihl reps last month at the tcia expo in baltimore and that was there main "marketing" thing about the 661 that it was indeed m tronic.
There are a number of 661 test saws out there including those fitted with M Tronic AND fuel injection but I've been led to believe the first lot of 661's to be released will be the good old standard carby. Probably a Chinese Zama
There are even some of the new Husky test saws out there with bolt on external boost ports. Now that is pretty cool