How do I figure year of Mariner?

bucchb

Petty Officer 3rd Class
Joined
Feb 23, 2008
Messages
76
I just swapped out the power head on a 1973 Mercury 85hp (trigger style distributer pain in the *&&$%!) to a newer 80's??? Mercury Mariner 80hp.

Serial # is 5144775, 80hp. anyone know what year this is??

Motor runs pretty good but seems to starve for fuel over 30 MPH, I am suspecting the fuel pump diaphram? Carbs were off and dipped and reassembled by a pro before the power head was installed.
 
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