Boat engine serial number lookup
What year is that outboard, really? Pick the brand, find the plate, and decode the model year — free, instant, and right in your browser.
Serial number vs. model number vs. HIN
Every outboard carries two codes on the plate: a model number (what the engine is — horsepower, shaft length, and on many brands the year) and a serial number (which individual engine it is). Neither is the boat's HIN — the 12-character hull number on the transom that identifies the boat itself. Buying used? Decode the engine here, then run the HIN free so the hull and the motor both check out.
Which brands encode the year?
Johnson & Evinrude (1980 onward) spell the year with the INTRODUCES letter key. Yamaha used a year letter from 1984–2004. Suzuki puts a year suffix (K7, L3, M2…) on the model code. Mercury & Mariner and Honda don't encode the year at all — their serials map to years only through dealer tables, though a Mercury serial prefix gets you to within a few years. Each brand page walks through it with a decoder or step-by-step guide.
Frequently asked questions
Where is the serial number on an outboard motor?
On almost every brand it's on a metal plate or sticker riveted to the transom bracket — the clamp assembly that mounts the engine to the boat. Some brands stamp a duplicate on the engine block under the cowling.
Can I tell the year of my outboard from the serial number?
It depends on the brand. Johnson/Evinrude (1980+), Yamaha (1984–2004), and Suzuki encode the model year directly in the model code, so you can decode it yourself. Mercury/Mariner and Honda do not — their year comes from dealer serial-range tables, though a Mercury serial prefix narrows it to an era.
Is the engine serial number the same as the boat's HIN?
No. The HIN (Hull Identification Number) is a 12-character code on the transom that identifies the hull, like a car VIN. The engine serial identifies only the motor — outboards move between boats, so on a used boat you should check both.
Why does the engine year matter when buying a used boat?
A boat is often sold by its hull year while wearing a much older repower — or the reverse. Verifying the engine year against the listing tells you the motor's true age, its parts availability, and whether the "2015 boat" is really a 2015 package.