Chainsaw Repair

Have this really frustrating problem.. Some months ago i bought a cheap cbainsaw in obi a german hardware store.. I took it home and gased it up seems to work fine put it away.. Now some months later i took it out again to use it had hard time cutting a tough tree.. The saw ran out of gas i refilled but she never started up again.. I replaced with new gas checked that the spark plug was fine.. Put starting spray inthe carburetor.. Cleaned the exhaust but nothing.. I pull the cable and she makes a starting purr but never cranks over to fully ignition.. Anybody have suggestions

Hey yes the chain moves freely its tkped to max with chainsaw oil.. I even cleaned out all the saw dust around.. But the problem is not that the chain saw startsnbut chain doesnt move..vthe. Problem is that engien doest crank over i just makes a purr when i pull the cord but no doest really startup totally...  The starter fluid was a tip i got from youtubes ericthecarguy and donyboy73.. The chain saw is a generic 51cc  there is no brand name it just says chainsaw on the lable its green.. It was on sale a stock brand.. The blade and chain are from oreon

Do you have the ability to check compression? If you do, check that,  if less than 100psi (689.4kPa) the saw is not going to start and run. You should then remove the muffler and have a look at the piston through the exhaust port, to determine if there is piston damage (scoring). Let us know what you find.

How do i check if the piston is scored? I took out the muffler and there was some sut blackish fuel... But i reall couldnt get a doog look at the piston.. But with the muffler and spark plug off the piston seems to move easily.. How can i check the psi inthe chamber?

OK some looked into through removed muffler didn't see any real signs of scorching on the piston.. All though with all the plug removal I just now broke the plug cap so next step is to replace this....