If you checked compression correctly and it is indeed 30psi than redo the test, this time putting 3 squirts of engine oil in cylinder and see if your compression rises. (Make sure throttle is wide open when doing compression )If not the problem will be in the valves. Have you adjusted the valves yet? It does not matter how it ran before it died. What matters is why it won't run now. You have to have fuel, air, spark and compression so these are the first things one has to know in order to isolate the problem period.
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