Just like a number of other posters ,my Stihl starts well hesitates on acceleration,thenpicksupnicely to about 1/3 or 1/2 throttle then bogs down and will quit unless I back off. The problem is in following the advice given to the FS 80 owners, is that this is an FS60 and I can't find replacment carbs or carb kits for it . Is there anyone out there with FS60 experience?