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For what it's worth, I think Cusser has it dead right. I had a similar totally unexpected failure on a different two stroke engine and traced it to a sheared woodruff key on the main shaft. The ignition timing is dependent upon that sacrificial key being intact , thus locking the flywheel in...

My engine has been idle for quite some time and now will not start. Have confirmed spark is working. Engine turns over on the starter cord but feels a bit lumpy. Have looked to see that the valves are moving and they both move freely and show signs of lubrication. What I have found is that the...