Small Engines (Lawn Mowers, etc.): chainsaw starting problem, propane gas, throttle settings

Question
A friend gave me a nonrunning homelite 18" 2.7 in3 chainsaw that had had only 1/2 tank of unmixed gas run through it before it stopped running (Its first ever tank of gas, with no  oil mixed!). Its original chain is still quite sharp. The saw then sat for three years. It definately has spark, similar to the spark from a good running 2 stroke trimmer I have. Thinking the plug might be bad I then put a plug from a known good running 2 stroke in it. I even tried starting it in the dark thinking the spark may be going elsewhere when the plug's in the motor under compression. It has consistent 95 psi compression (with a push-on type compression tester). The fuel filter is clear, no clog, I dismantled the carb and it looks pristine, no corrosion or dirt at all. I tried putting a little gas in the plug hole, I tried putting gas right through the carb with the piston at tdc so the gas would go straight into the crankcase, I even tried putting propane gas in the carb inlet. I cleaned the plug after each failed attempt, sometimes with gas wet on the plug, sometimes not. I tried starting it according to the manufacturers"easy start" procedures and then at various throttle settings. Everything I see says this motor is like new but NOTHING makes this motor even pop once. What am I missing here? Thanks.

Answer
 Hello Ken:

 Remove the Muffler and Inspect the Cylinder and Piston. How Bad is the Scarring in the Cylinder and On the Piston. On Chainsaws, the Compression can Show Good but if there is a Large, Deep or Numerous Small Scratches in the Cylinder or the Piston; the Engine will Not Run. The Engine May Lose the Compression Just as the Piston is Reaching Full Compression and the Plug Fires because of the Scratches in the Piston and the Cylinder being Deepest at this Point. If you know how, I would suggest you Remove the Jug and Inspect it for Gouges in it. Hope this Helps. Let me know what Happens, Please. Thanks.