How much difference is there between a 6401 and a 7901 with both running a twenty inch bar? Anyone tried them both?
I have both , a PS-6400 & PS-7900 , stock , pretty much the same as the PS-6401 & PS-7901.
I agree with everyone saying that the PS-6400 is no match to her big sister the PS-7900 when compared next to each other.
But I think that even the "small" PS-6400 has its place.
This week I bucked up my uncles firewood beech tree trunks , they where 8 to 20" in diameter (regular firewood size around here).
I used both my saws , starting with either one using it till the tank was empty , then continued with the other.
My opinion is that anything up to 20" the PS-6400 handles fairly well , and anything significantly under 20" the PS-7900 is pure overkill.
This opinion is currently based on following wood types: cherry , hornbeam , beech , oak , pear.
There is no denying that the PS-7900 has significantly more grunt and asks for larger diameter trees , but she is also more fuel hungry then the PS-6400.
By my estimation the PS-6400 ran about 10-15 minutes longer on a full tank then the PS-7900 - same fuel , same wood pile , both running 20" bars , both chains having identical wear and been file sharpened by me.
It all adds up to what You need Your saws for!
I don't intend to "get rid" of my PS-6400 , on average I use her slightly more then my PS-7900.
They are both great saws in my eyes!
Cheers