She has very good compression, and runs excellent strong and idles. I did not remove spark plug and put the gauge to it yet. I installed a new fuel line, old one was rotted off and cleaned the saw up a bit and installed a rim sprocket drum and 21" roller nose bar with new chain. Today I finished a few cosmetic upgrades and I will post some pictures tomorrow, paint should be dry on the top cover by then, it was painted orange/puke yellow by whomever previously owned the saw over a the gray prime must have been replacement cover and it was UGLY. sanded all that off and gave a quick shot of black, supposed to be black according to acresinternet.