The second is that the water inlets are clogged no water is getting to the pump, so it isn’t pumping.

The first is that the water stream fitting - the outlet hole for an outboard motor’s cooling system - is clogged. There are three reasons your outboard motor’s impeller won’t pump. How do you read a serial number on a boat motor? It will have the model number, serial number, and month and year of manufacture printed on it. Open the cover and look for an aluminum plug on the engine block. How do you tell the year of a Suzuki outboard motor? The model number will identify the year and certain details of that motor. The nameplate should contain a model number and a serial number. Your Johnson outboard model number can usually be found on the nameplate located on the motor or the mounting bracket. These digits coincide with the last two digits of the year in which the outboard was manufactured. The latest serial number labels display a 2-digit number in a box at the lower right portion of the label.

Every Mercury outboard has a serial number label located on the transom bracket area of the engine.