SawTroll
Information Collector
It shuts down because there is no sense wasting gas on sub 6". It just falls into 18" lengths out of fear. Oh yeah, we already had that thread.
I love my 361 and I do think the 18" is the sweet spot for it.
I would say 16" is the sweet-spot, 18" a very good compromize - and regular use of 20" is 70cc territory.
The above is mostly about balance, not about lack of power.