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Have you pulled the side/valve chamber cover as suggested? You may just have a sticky valve or a bit of carbon under the valve. A lot less work than replacing a head gasket that may have been on for a long time - difficult to get off. Research or ask about ways to fix a sticky or carboned valve. Some add/spray Marvel Mystery oil in through the carb Intake, or add to the gas and drive for a while, for the sticky valve issue.