Over the years, manufacturers have changed where this information is located on an outboard. I'll try to be as complete as possible below, while keeping this reasonably simple.
Mercury
Prior to 1969, Johnson model numbers were year-specific; serial numbers were used in identification. Johnsons from the 1969 to 1979 era use the last two digits of the year at the end of the model number to identify the model year; for example, a Johnson model number ending in '-4RL79' was built in 1979. Honda Outboard Model Year Look-up Guide. Find the model year code in your model number and determine the year using the key below. DuMonte displayed the motors at a New York exhibit. Several hundred outboards were ordered. As DuMonte had purchased the name and rights to the Champion outboard motor from Sig Konrad, they shipped with the brand name CHAMPION. From 1935 to 1939, Scott and Atwater still operated their tool and punch press business as well as building outboards. Paul made Champion Outboard motor, approx. 1927 at Antique Outboard Motor Club meet at Tomahawk WI. Very rare motor, never have seen.
On older Mercury outboards, going back into the 50's and possibly even earlier, the serial number would generally be viewed at the leading edge of the swivel bracket, as seen in the image below. If for any reason that number may have been changed, removed, or can no longer be read, every Mercury had a freeze plug, which is on the powerhead and about the size of a quarter. That freeze plug will have a serial number on it. So long as you know your HP and the serial number, you can identify the year of your outboard.
On later model Mercury engines, the serial number was located on the swivel bracket, as shown in the picture below. First, these would be on a metal tag and stamped with the numbers. Later, the numbers were printed on a vinyl tag. Unfortunately, you'll often find that the vinyl tag has washed out. If you can no longer read the number on the tag, you’ll want to find that freeze plug on the powerhead in order to identify the outboard.
Johnson & Evinrude
Old Champion Boat Motors
Johnson and Evinrude outboards both work with model numbers for identification. In most cases, the model number is located on either the transom or swivel bracket. It can usually be found on a either a metal plate on earlier models or a sticker on later models. Once they switched over to the tags, this was another number that often washed out and could no longer be read. In this case, the powerhead freeze plug can be located and will have the serial number. The serial number itself won't do you much good, but an authorized dealer can use the serial number to match the engine up with a model number again.
Chrysler Outboards
Chrysler outboards work by a model number. There are 2 locations where you may find this number. Early Chrysler models stamped it on a metal plate and it was placed under the carburetors, inside the lower cowling, or pan. Later models used the same plate, but you'd find it on the side of the transom bracket.
Force outboards used model numbers on vinyl tags, many of which washed out. If the number washed out, you may find a small sticker either on the cylinder head cover or the starter bracket. If that fails, all is not lost. There are numbers stamped on your carburetor. Take those numbers and google them or email us. Those numbers will usually nail down a year and HP for your engine.
Other Makes
Nissan, Tohatsu, Suzuki, Yamaha, and Yamaha Mariner use both model and serial number information. That tag can almost always be found on the side of your transom bracket, as shown below.
Contact - Randy Kallevig -AOMCI Caille Special Interest Group Leader for Caille info
Contact - Emma Craib -AOMCI Caille member and owner of these web sites for webby stuff
Jack Craib's
Caille
Outboard Information Pages
This site is only concerned with Caille outboard motors.
From the teens into the 30s they produced many models.
Champion Outboard Motors Serial Numbers
They also made motors for retailers that were sold under other names;
these are called badge motors.
This site will help you to research your motor by visually matching it to photos and catalog pictures, and give tips on what to look for. If you are new to old motors you will learn a lot by having to pay such close attention to little details!
Feel free to contact RandyAFTER you have given it a shot.
Don't worry if you couldn't figure it out...if you tried, that is all we ask!
Champion Outboard Motor History
This site is currently a group effort of AOMCI members,
with special thanks to Randy Kallevig, and Emma Craib.
Champion Outboard Motor Serial Numbers Online
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The use of the information contained within Jack Craib's site is free and may be copied for personal use. These materials may not be copied for commercial use or distribution, nor may these materials be modified or reposted to other sites (other than discussions in forums) unless permission is granted.