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The early SMALLER Mariner motors were indeed built by Yamaha.-----That was in the mid 1980's----Top of this page is a box for----" engine diagrams "----Click on Mariner.
Your serial number shows the engine coming up to be a 1985 40-H.P (EL) L= Long Shaft (20"), E = ELECTRIC START Model Number 7040525 http://www.marineengine.com/parts/mariner-outboard-parts/40c-twin-carb/6e9400231-thru-6e9423162---elI’m trying to figure out what year and possible make my motor is so I know what spare parts to buy.
The motor is a Mariner 40 but has a Yamaha serial plate.
The plate is as follows:
Yamaha 40EL
6E9 L 415125
Any help identifying this motor would be greatly appreciated!