Scott-Atwater Outboard Model Identification

Scott-Atwater:  1946-1958 1/2 Pint of Oil per gallon   1959. 3/8 Pint Per Gallon

The 1946-1951 outboards have three digit model numbers. The first two digits are the years and the last digit is for the horsepower. I don't know how the last digit correlates to the horsepower. They are as follows:

I have found that the master manual shows the 1946-47 as a 3.5 hp. I have ads that show it as a 3.6 hp. The back of the master manual also shows it as a 3.6 hp.

1946:     461   3.5 hp     467   3.5 hp Deluxe

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   4.0 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     (Represents the MPH the outboard would push a boat) This was on the outboards gas tank decal and only used in 1951-52.

The 1952-1958 outboards have a four digit model number. The last two digits when reversed is the year of the outboard. For example: the 1952 5 hp is a 3725. From 1952-1958 the first two digits stayed the same for the size outboard they represented. For Example: the 1952 5 hp had the first two digits of 37. That stayed the same from 1952-1958.  There is an exception, the  1958 22, 40 and 60 hp have a different model number. They will be listed below. 

For outboards from 1952-1958 that are 16hp and under reverse the last two digits for the year. The first two digits are for horsepower. The horsepower is as listed:

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 the 30 hp had a model number 3655. This was the first and last year of the 30 hp.  1956 saw this motor as a 33 hp with a model number 3665. 1956 was the first and the last year of the 33 hp. 1957 saw this motor as a 40 hp with a model number of 3675. Scott-Atwater used the 36 starting digits for the 30, 33 and 40 hp in consecutive years. 1958 saw the new 22 hp outboard. This 22 hp was tagged with a 3 digit model number. 1958 also saw the new 60 hp which also was tagged with a three digit model number. I will list these outboards with there model numbers.

(1955) Model: 3655  30 hp   (1956) Model: 3665 33 hp  (1957) Model: 3675 40 hp  (1957) Model numbers that have a -2 suffix is for long shaft. 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. 

(1958) Model: 135 (235 if long shaft, 335 if electric start, 435 if electric start long shaft) 22 hp. 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. 

(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. 60 hp (Flying Scott) 332 electric start, 432 electric start long shaft.

The 1959-1960 outboards brought a new model number that included numbers and letters. 

(1959) The outboards were back to three numbers ending with the letter A.

(1960) The outboards all started with a letter then a number then two more letters. 1959 and 1960 saw the return of the Bail-A-Matic to all the outboards except for the 3.6 hp. 1959 saw the end of the 16 hp as well as the 22 hp. This year brought us a new 25 hp outboard. 

(1959) Line of outboards...3.6, 5, 7 1/2, 10, 25, 40 and 60 hp outboards. (1960) had the same line except for the addition of a 12 hp.

The model numbers for these two years are as follows:

(1959)  (130A)  3.6 hp   (137A)  5 hp   (133A)  7 1/2 hp  (138A)  10 hp.  25 hp are as follow: (135A) manual start  (235A) long shaft manual start  (335A) electric start  (435A) long shaft electric start. 40 hp are as follows: (136A) manual start (236A) long shaft manual start (336A) electric start (436A) long shaft electric start. (536A) Royal Scott  (636A) Royal Scott long shaft. 60 hp are as follows (332A) electric start (432A) long shaft electric start,

(1960) (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 ho Flying Scott long shaft electric start.

This page was copied from http://www.scottatwater.com