Scott-Atwater Scott Atwater Outboard Motors
   
Scott-Atwater Outboard Motor Home
Scott-Atwater Outboard Motor Forum
     

 

Scott-Atwater Outboard Motor Models

Scott-Atwater Company History

Scott-Atwater Outboard Motor Links

 

Scott-Atwater Outboard Motor

Model Identification

The Early Years

The 1946-1951 outboards have three digit model numbers. The first two digits are the year and the last digit designates the size for the motor.

0 - Standard Single
1 - Deluxe Single
3 - 7.5 Hp Twin
6 - 30 Hp Twin
7 - 5 Hp Twin
8 - 10 Hp Twin
9 - 16 Hp Twin

At a glance, then, you can tell that a 497 is a 5 Hp twin made in 1949, a 470 is a standard single made in 1947. The only exceptions are the 1946 models, which are designated 461 and 467 for the standard and deluxe single.

1946:     461   3.5 Hp     467   3.5 Hp Deluxe (some docs refer to this as 3.6 Hp)

1947:     470   3.5 Hp     471   3.5 Hp Deluxe    473   7 1/2 Hp

1948:     480   3.6 Hp     481   3.6 Hp Deluxe    483    7 1/2 Hp

1949      491   4 Hp         497  5 Hp     493  7 1/2 Shift   

1950      500   3.6 Hp      501  4 Hp     507   5 Hp   503   7 1/2 Hp   509   16 Hp

1951-52   510  (1-12)  3.6 Hp   511 (1-14)  4 Hp   517  (1-16) 5Hp   513 (1-20) 7 1/2 Hp 518 (1-25) 10 Hp   519 (1-30)  16 Hp     The speed designation (inside parenthesizes) represents the MPH the outboard would push a boat in best possible conditions. Example 1-20 means the motor has a trolling speed less than 1 MPH and a top speed of 20 MPH. This was on the outboard's gas tank decal and only used in 1951-52.

1952 - 1958 Four Digit System

1952 premiered the four digit model number system. The first digit, 3, is always constant and indicates a Scott-Atwater product. The last two digits when reversed are the year the outboard was manufactured. For example: the 1952 5 Hp is a 3725. The second digit designates the size of the motor, as above for 1946 - 1951. For example: the 1952 5 Hp twin had a four digit designation of 3725. There are exceptions. They will be listed below. 

Horsepower Cheat Sheet:

30)  3.6 Hp    37) 5 Hp   33) 7 1/2 Hp   38) 10 Hp   39) 16 Hp 

Example: A 3865 model number would be a 1956 10 Hp. 

Now for the exceptions: 

In 1955 (its only year) the 30 Hp had a model number 3655.
In 1956 (also its only year) the 33 Hp with a model number 3665.
In 1957 Scott-Atwater debuted a 40 Hp with a model number of 3675.

So Scott-Atwater used the 36 starting digits for the 30, 33 and 40 Hp in consecutive years.

Model numbers that have a -2 suffix are for long shaft versions. Used on 5, 7 1/2, 10. On the 16 Hp -3 was electric start. -4 on the 16 Hp was electric start long shaft. 1957 model numbers for the 40 Hp ending with a -2 are long shaft, -3 electric start, -4 electric start long shaft. -5 Royal Scott, -6 Royal Scott long shaft. 

In 1958, the 22 Hp debuted as model: 135 (standard shaft), 235 (long shaft), 335 (standard shaft electric start), and 435 ( electric start long shaft). Also, the 1237 is a 5 Hp long shaft, 1233 is a 7 1/2 Hp long shaft, 1238 is a 10 Hp long shaft, 1239 is a 16 Hp long shaft. 

The 1958 40 Hp motors are as follows. (Super Scott) 1236 long shaft, 1336 electric start, 1436 electric start long shaft. (Royal Scott) 1536 electric start, 1636 electric start long shaft.

The 1958 60 Hp (Flying Scott) motors are the 332 electric start, 432 electric start long shaft.

The Later Years

(1959) The outboards were back to three numbers ending with the letter A. Available outboards were: 3.6, 5, 7 1/2, 10, 25, 40 and 60 Hp. In 1959 the Bail-A-Matic returned on all the outboards except for the 3.6 Hp. It was also the first year without a 16 Hp model, and the 25 Hp replaced the 22.

(130A) 3.6 Hp
(137A) 5 Hp
(133A) 7 1/2 Hp
(138A) 10 Hp.
(135A) 25 Hp manual start
(235A) 25 Hp long shaft manual start 
(335A) 25 Hp electric start 
(435A) 25 Hp long shaft electric start
(136A) 40 Hp manual start
(236A) 40 Hp long shaft manual start
(336A) 40 Hp electric start
(436A) 40 Hp long shaft electric start
(536A) 40 Hp Royal Scott
(636A) 40 Hp Royal Scott long shaft
(332A) 60 Hp electric start
(432A) 60 Hp long shaft electric start,

(1960) All outboard model identifications all started with a letter, a number. and then two more letters. Available outboards were: 3.6, 5, 7 1/2, 10,12 ,25, 40 and 60 Hp outboards. 1960 motors continued the Bail-A-Matic on all the outboards except for the 3.6 Hp.

(A3BB) 3.6 Hp
(A3EB) 7 1/2 Hp
(A3FB) 12 Hp
(A3GB) 25 Hp
(B3GB) 25 Hp long shaft manual start
(C3GB)  electric start and generator
(D3GB) long shaft electric start
(A3HB) 40 Hp manual start
(B3HB) 40 Hp long shaft manual start
(C3HB) 40 Hp electric start
(D3HB) long shaft electric start
(E3HB) Royal Scott electric start
(F3HB) Royal Scott long shaft electric start
(C3JB) 60 Hp Flying Scott electric start
(D3JB) 60 Hp Flying Scott long shaft electric start.

Caveat

The above information is as correct as I can make it. Please post a message in the forum if you have any additional information or sources to complete or enhance the above