First of all when you remove the plug and pull the cord does gas come out of the cylinder?
Second. The Spark plug could be too long and hitting the piston when the piston comes up. This is most likely the case. Is the gap closed on the plug? If it is then the piston is hitting the spark plug. I use Autolite 255 in my saws without problems.
David Trowbridge
October 2009
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