1977 Evinrude 4HP Outboards Service Repair Manual, PN 5303, Page 55Get this manual

1977 Evinrude 4HP Outboards Service Repair Manual, PN 5303, Page 55

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