1972 Johnson 4HP Outboard Motor Service Repair Manual P/N JM-7202, Page 16Get this manual

1972 Johnson 4HP Outboard Motor Service Repair Manual P/N JM-7202, Page 16

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LEAF VALVES The leaf valves time the injection of the fuel mixture into the crankcase by opening only when the pressure in the crankcase has dropped to predetermined point on the compression strokeSee

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