Chainsaw Repair

JMO  some of the best woods port saws I ever ran were in that 180 range.  I still in my we little mind thinks it has more to do with the porting numbers for a good running saw.

Case in point my 066 Brent Combs woods ported and many more just like it. Using info I was told passed down from his dad a logger. 
It used stock piston and just good porting and was in that 180psi range.   As far as I know the squish wasnt cut.

That saw owned the gtg cant races for years and pulled a longer bar like you want a work saw to do. 

Brent Combs also did one of my 084 with stock piston and far as I know no squish was cut. That saw took names at gtg's too. Then I sold it to a guy that put a 50" plus on it for ripping hardwoods for a living. 

The reason I got away and sold all my pop up piston saws is I didnt want to depend on anyone to cut me another piston when needed someday.