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Martin

1947 - 40
1953 - 20

Martin outboards were a brand that had a lot of potential to be a major player in the outboard world but could not face the competition from OMC, Mercury and others. They were manufactured by National Pressure Cooker Company of Eau Claire, Wisconsin from 1946 through 1954. Martin motors were of a very high quality and sported a number of innovative features - the most important was the mechanically actuated intake poppet valve.

Without some type of check valve between the crankcase and carburetor, two stoke motors would not run since air would not flow in one direction through the carburetor (remember the bernoulli principal from physics class?). To remedy this problem the intake design on two stroke motors falls into three categories;

1) Piston ported
2) Rotary valve
3) Reed valve

George Martin improved the reed valve concept by using mechanically actuated poppet valves. These mechanical valves were timed to stay open longer and seal better than the simple flap on a reed valve. Actuated by the engine crankshaft, the design was simplicity in itself and made for a motor that ran much better at low and mid range speeds.

1947 Martin "40" 4.5 hp.


Year & Model:
1947 Martin 40
Horsepower: 4.5 @ 4,000 rpm
Cylinders:
2 - Alternate Firing

Bore: 1.5625"
Stroke: 1.5"
Ignition: Wico magneto
Point Gap: .020
Cooling: Water by rubber impeller

Condition: Unrestored
Retail price when new: $145.45
Weight: 37 lbs.
Oil/Gas Mix: 3/4pt TCW-3
Spark Plug: Champion J-8J (Now J-8C but J-6C have been found to be a better heat range with today's fuel)

Comments:
The Martin 40 runs like a champ and idles superbly. It sports a number of cool features like the knob to easily adjust the trim (seen on the photo to the left just above the transom knobs). Tilt the motor and press a lever to unlock the leg and it will swing into the boat to make changing the shear pin a breeze! The only negative is the Tillotson carburetor that can be finicky.

 

1953 Martin "20" 2.3hp.


Year & Model:
1953 Martin 20
Horsepower: 2.3 @ 4,300 rpm
Cylinders:
1

Bore: 1.5625"
Stroke: 1.5"
Ignition: Wico magneto
Point Gap: .020
Cooling: Water by rubber "wobble pump"

Condition: Unrestored
Retail price when new: $114.75
Weight: 30 lbs.
Oil/Gas Mix: 3/4pt TCW-3
Spark Plug: Champion J-8J (Now J-8C but J-6C have been found to be a better heat range with today's fuel)

Comments:
This is a fine little motor and idles so slowly that it is unbelieveable!

My youngest boy "Manning A Martin" a few years ago. Motor is a 1953 Martin "75" Twist Shift with Aquamatic speed control. A fine running and very enjoyable outboard.

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