The Mercury Marine serial number 1B778159 is 2 Stroke Carb 75 (3 CYL.) engine that’s part of the outboard model 1090412FY. It was produced during the years 2005 and 2006. The engine displacement is 84.6, and the horsepower ranges from 75 to 90. The engine belongs to the serial range and catalog [0T980000 THRU 0T999999] – USA – Cat.# 90-803147001. Related components are listed below.