1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 20Get this manual

1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 20

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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 strokeCHO

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