First make sure throttle is wide open when performing compression check.Usually if you have no compression it would indicate bad open valve, or rings are totally worn. Try squirting 2-3 squirts of engine oil in cylinder then retest compression. If the compression rises rings are bad, if not valve is bad. After these checks pull the head to see how head looks and also inspect the cylinder for any scratched, wear or gouging. Let us know what you find then we can let you know what rout to take.
TOM
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