The right lower number (see no. 1) is the serial number. The letter beside the serial number (see no. 3) is the shaft length. The detail below the word Yamaha (see no. 4) is the engine prefix code. The letter beside LTD is the code when the outboard is manufactured. When is my Yamaha outboard manufactured?. If your are still unsure of your engine year, search for your model number on the Johnson 1980-later serial number year chart located here. 1969-1979 The actual year is found in the model number, not the serial number. For example, 150TXL78 is a 150hp engine from 1978. 65ESLR72 would be from 1972. Pre 1969
![[4+] How Do You Read A Yamaha Outboard Serial Number,](https://ww2.justanswer.com/uploads/oldnewenglandmarine/2012-02-11_150706_yamage.jpg "[4+] How Do You Read A Yamaha Outboard Serial Number, Yamaha Outboard")
![[41+] Yamaha Outboard Parts By Serial Number,](https://blog.simyamaha.com/wp-content/uploads/2020/02/Yamaha-Early-Model-Code-Deisgnation-Chart.jpg "[41+] Yamaha Outboard Parts By Serial Number,")
First locate the Model Number located on a label on the outboard's transom bracket. All Yamaha outboards manufactured between 1984-2004 will have this identifying sticker on the transom bracket of your outboard motor. Identify Model Number. The top number is the model number. What you are looking for is the last letter in that model number.. A: The model number (like F90LB) identifies the type and specifications of the motor. The serial number is unique to your specific unit and identifies that exact motor. Q: How can I verify if my used Yamaha outboard's serial number is legitimate? A: Contact an authorized Yamaha dealer with the serial number.