The Mercury Marine serial number 1B042172 is 2 Stroke DFI (OptiMax) 225 (DFI) 3.0L engine that’s part of the outboard model 1225D73DD. It was produced during the years 2004, 2005, and 2006. The engine displacement is 185.76, and the horsepower ranges from 200DFI to 225DFI. The engine belongs to the serial range and catalog [0T801000 THRU 1B417701] – USA – Cat.# 90-803485004. Related components are listed below.