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Mariner 4hp are identical to Yamaha engines.
You should find a sticker on the port bracket with serial and model number.
If that sticker has disappeard, an aluminum piece is stamped in the side of the cilinder. The numbervstamped in that round pieceis the serial number. I can convert that serial number in a year/model number...
According to i-Boats, "Nothing in the Mercury Mariner Outboard engine model numbers or serial numbers provides year information directly.
The first serial number sold in a year becomes the beginning serial number. Serial numbers between that year's beginning serial number and the next fall into the same year. Search for your engine horsepower on the Mercury Mariner serial number year chart located here to find the beginning serial number for the range that includes your engine." Your other option is to take the serial number to an authorized Merc marine eager and they can look it up for you.
There is no data included in the serial number that gives info of what year the engine was made. You can, however look up the number here, and that will tell you the year of manufactor.
Every Mercury outboard has a serial number label located on the transom
bracket area of the engine. The latest serial number labels display a
2-digit number in a box at the lower right portion of the label. These
digits coincide with the last two digits of the year in which the
outboard was manufactured. For example, if an outboard was manufactured
in 2010, the number "10" would appear in the box at the lower right
portion of the label.
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