The Mercury Marine serial number 9B398851 is MotorGuide Fresh Water Series part of themodel 921310120. It was produced during the years 2003, 2004, 2005, and 2006. The engine displacement is , and the horsepower ranges from 12V, 24V, to 36V. The engine belongs to the serial range and catalog [9B000001 & Up] – Cat.# 90-889474. Related components are listed below.