The Mercury Marine serial number 0R373644 is 4 Stroke 10 Carb(2CYL)(4-STROKE) engine that’s part of the outboard model 1F20201HK. It was produced in 2006. The engine displacement s are either 19.7, 21.42, or 30.4, and the horsepower ranges from 10, 15, to 20. The engine belongs to the serial range and catalog [0R575531 THRU 0R833819] – Cat.# 90-898103160. Related components are listed below.