timing issue

Hi All, I am writing in hopes of some expertise on a Dolmar PS 7900 advanced timing set up. I have a PS 7900 which was build by a gentleman who has passed away so I cannot go back to him for help. Here is what I have been told has been done to it. Finger ports, 272 coil, opened up muffler...

I have been going back and forth on this saw for about a year. Its old, most likely wore out. But it was my dads and I want to keep it cutting (since he passed away its like keeping his memory in the woods with me) Long and short of it, the compression was low (after cutting thousands of face...