Frankie
I Build and Run Ported Saws !
Muffler mod , timing advance , picco chain and a retune of carb will reap large gains for not much coinThe 660 does come up in the tree time to time, even the 3120xp. It's almost aways a pain, not because of the saw itself, but because of the seize and the weight of the logs/ blocks of wood to deal with aloft. Not enough training/technique here.
I have to look in my 201T. I found it sluggish now.