The Mercury Marine serial number 1B379772 is 2 Stroke EFI 225 (3.0L EFI) MARATHON engine that’s part of the outboard model 1250423FY. It was produced during the years 2004, 2005, and 2006. The engine displacement is 185.76, and the horsepower ranges from 200EFI, 225, 225EFI, 250, to 250EFI. The engine belongs to the serial range and catalog [0T801000 THRU 1B417701] – USA – Cat.# 90-803199004. Related components are listed below.