The Mercury Marine serial number 1B803724 is 2 Stroke DFI (OptiMax) 75 DFI (3 CYL.)(1.5L) engine that’s part of the outboard model 1090D73HY. It was produced in 2006. The engine displacement is 92.87, and the horsepower ranges from 75DFI, 90DFI, to 115DFI. The engine belongs to the serial range and catalog [1B417702 THRU 1B736885] – USA – Cat.# 90-891837007. Related components are listed below.