The Mercury Marine serial number 1B289055 is 2 Stroke DFI (OptiMax) 75 DFI (3 CYL.)(1.5L) engine that’s part of the outboard model 1115D73FY. 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 [1B227000 THRU 1B417701] – USA – Cat.# 90-891837006. Related components are listed below.