Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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You are correct in that the deposits on the plug indicate that the saw is running hot. I would suggest adding a little more oil to your fuel mixture to take care of that. However the damage may have already been done since you say you can't get the saw restarted. It may have damaged the piston and cylinder from a lean fuel mixture and getting so hot. What kind of compression do you now have on the machine?
You need at least 90 psi in order for it to start and run properly. Sometimes you can get them to start if at 85 psi but it is really hard you may have to pull it 15 times really fast to get it to fire up.
As long as the compression is still good then you should be fine to add a little more oil to the mixture. Instead of running it at the recommended 50:1 I would run a 40:1 mixture which is 3.2 ounces of oil per gallon of fuel.
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