Recently purchased a mercury outboard serial #0A751844 (Canada) with no stickers on it. When I look up the serial number it gives me model #1020201GC, 1989 20HP but also says 20 H.P /25 H.P. SEA PRO /MARATHON 25 SUPER 15. How can I know what HP/model the motor is? The carburetor needs rebuilding...
