This is the first Scott-Atwater available and one of the most common. Features a detailed and complex multi-piece cowl. The motor was painted with the same green but, a brighter gold paint than seen on its real-life counterpart. Even though this is a common motor, its accurate and unique look makes this more desirable than other common models. This motor also has an “error box” that features a “30HP” marking on the cover rather than the correct “33HP”. There is also a “black-out” version which has a black bar over the incorrect “30HP”marking. These boxes are very rare and highly desirable.

Notable Traits:

Height: 5.5 inches

“Japan” in raised letters on lower unit

Unique and complex multi-piece cowl construction

A common motor but, more desirable than other common models

One year only design

Solid driveshaft between motor and propshaft

2-Blade Prop

Dark green wires with red and blue insulators

Offered in a brown box with black and red Scott-Atwater graphics

Came with instruction sheet, white plastic stand and metal battery post terminals

Very rare “error-boxes” have a “30HP” marking rather than the correct “33HP”

3 to 6 Volts

Rarity: 1/5 (with error box Rarity: 3/5)
Desirability: 2.5/5 (with error box Desirability: 3.5/5)
Value: 2.5/5 (with error box Value: 3.5/5)

*Ratings based on 1-5 with 1 being least and 5 being most

An entirely new “boxy” design for the second year of K&O Scott-Atwater. Like the 1956 model, this is one of the more common models available. With its simplistic design and lackluster decals, the 1957 model is the least desirable Scott-Atwater. Features a multi-piece layered faceplate that is usually missing the small front grab handle. The box for 1957 was updated in a green primary color with new yellow and white graphics.

Notable Traits:

Height: 5.5 inches

“Japan” in raised letters beneath cowl tray towards front

Simplified design and construction

Multi-piece layered faceplate

Not as desirable as other Scott-Atwater models

Solid driveshaft between motor and propshaft

2-Blade Prop

White wires with red and blue insulators

Offered in a green box with yellow and white Scott-Atwater graphics

Came with instruction sheet, white plastic stand and metal battery post terminals

3 to 6 Volts

Rarity: 1/5
Desirability: 1/5
Value: 1.5/5

*Ratings based on 1-5 with 1 being least and 5 being most

1958 40HP used the same motor as the 1957 model with updated bolder decals. This motor is less common and more desirable than the 1957 but, not considered a rare motor. Features a multi-piece layered faceplate that is usually missing the small front grab handle. This motor came in the same green box with yellow and white graphics as the 1957 model.

Notable Traits:

Height: 5.5 inches

“Japan” in raised letters beneath cowl tray towards front

The same simplified motor that was used in 1957

Multi-piece layered faceplate

More desirable than the 1957 Scott-Atwater 40HP

Solid driveshaft between motor and propshaft

2-Blade Prop

White wires with red and blue insulators

Offered in the same green box with yellow and white Scott-Atwater graphics as the 1957 model

Came with instruction sheet, white plastic stand and metal battery post terminals

3 to 6 Volts

Rarity: 1.5/5
Desirability: 2/5
Value: 2/5

*Ratings based on 1-5 with 1 being least and 5 being most

The 22HP is one of the rarest K&O motors available and the first “small” Scott-Atwater offered. This motor is highly desirable and very valuable. The motor mimics the look of the larger HP version with simplified design and construction. This motor is the only blue Scott-Atwater available from K&O. This motor came in a very rare “painted” box with a red Scott-Atwater motor facing away from the viewer on the cover. This 1958 model also came with a very rare small aluminum spacer for the transom bracket.

Notable Traits:

Height: 4.75 inches

No country-of-origin markings on motor

Very rare and desirable motor

First “small” Scott-Atwater

Spring-drive drivetrain between motor and propshaft

2-Blade Prop – smaller dimensions than larger motors

White wires with red and light blue insulators

Single screw transom clamp

Available with rare small aluminum spacer for transom bracket

Offered in a very rare “painted” box featuring a red Scott-Atwater motor facing away from the viewer on the cover

Came with instruction sheet – no stand included

3 to 6 Volts

Rarity: 5/5
Desirability: 5/5
Value: 5/5

*Ratings based on 1-5 with 1 being least and 5 being most

This motor is the last of the K&O Scott-Atwater line. No large HP Scott-Atwater motors were made in 1959. Not nearly as rare as the 1958 22HP, the 1959 25HP is still semi-rare and very desirable. The only updates for 1959 25HP are the red cowl color and updated decals. The box for this is a “painted” box with a red Scott-Atwater motor facing the viewer on the cover. The box for the 1959 25HP motor is not as rare as the 1958 22HP painted box, but still semi-rare.

Notable Traits:

Height: 4.75 inches

No country-of-origin markings on motor

Semi-rare and very desirable motor

Last K&O Scott-Atwater offered

No large HP motor was available in 1959

Spring-drive drivetrain between motor and propshaft

2-Blade Prop - smaller dimensions than larger motors

White wires with red and light blue insulators

Offered in a “painted” box featuring a red Scott-Atwater motor facing towards the viewer on the cover – box not as rare as the 1958 22HP painted box

Came with instruction sheet – no stand included

3 to 6 Volts

Rarity: 5/5
Desirability: 5/5
Value: 5/5

*Ratings based on 1-5 with 1 being least and 5 being most