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The horsepower of the outboard is indicated by the number, and the year of manufacturing is indicated by the letter after the number. The Yamaha model number and year may be found at the upper right of the screen. The serial number, which is usually four to eight digits long, is most typically found around the tuning pins, either written directly on the plate or etched in the wooden pinblock and visible via a cut-away piece of the plate.
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