I've got 6 Stihl chainsaws from 009 to 036 and they all have about 80 to 100 p.s i. compression according to my testing. From reports I've been reading, and in ads, like e-bay ads, they report 150 and 160 p.s.i. compression rating. Am I doing it wrong? I tape throttle open pull cord about 10 times and watch guage. I'm ready to get a new compression tester.