Shame this thread is so old.
I have only just found it and joined to give my opinion.
I have owned both.
The PPT260 was a blood mess and all sorts of things kept going wrong.
Lucky Echo sorted all these out and the PPT265 and now the PPT266 are a great tool to use.
I have used these for over 10yrs and I can only say I would never, never own a PPT260. Even if you gave me one I would sell it and go buy a new model.
As for the carb issue i think they have sorted it out. I am one of those who rated the Walbro carbs as a great easy carb to play with. These new ones are not so easy to tune.