1981 Johnson/Evinrude 4HP Outboards Service Repair Manual P/N 392069, Page 56Get this manual

1981 Johnson/Evinrude 4HP Outboards Service Repair Manual P/N 392069, Page 56

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DESCRIPTION EXHAUST RELIEF Normally, exhaust gases conducted down through the exhaust housing and out the underwater outlet in the gearcaseThe siphoning action of the propeller and water provides unre