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Small Air Cooled Gasoline Engines Briggs & Stratton, Clinton, Lauson, Maytag, Nelson, Wisconsin and other small air cooled engines. Sub forums for mowers, scooters and powered eqipment.

Small Air Cooled Gasoline Engines

Lauson Model 55A

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Old 08-19-2019, 02:15:45 PM
bsaeland bsaeland is offline
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Default Lauson Model 55A

I just purchased a Lauson Model 55A. I believe the serial # is 5426673. Can anyone tell me the year of this? Also, all the pictures I am seeing show a round gas tank. Mine has a rectangular one. Is this original or has the tank been replaced at one time.

Thank you.


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Old 08-22-2019, 05:30:36 PM
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Craig DeShong Craig DeShong is offline
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Default Re: Lauson Model 55A

Just after the Tecumseh purchase of Lauson in 1956, Tecumseh brought to market a CH17 engine. This engine looks much like the engine you have. I believe it was based upon the 55A engine, but was marketed in the literature to develop 1 3/4 HP. It had the Tillitson carb as your engine has but I believe it had a block matching the 55AB (as opposed to the 55A and 55S block) as you have.

The distinguishing feature of your engine is the fuel tank, which appears to be the tank used on the CH17. Did someone take a tank off a junk CH17 and place it on your 55A engine? Maybe Tecumseh built several 55A with this CH17 tank? Hard to speculate.

There was a time I was looking high and low for a CH17 to help complete my air cooled Lauson collection; but I never did find one.

An interesting engine you have there.

I would guess your engine was built in the mid to late 1950's. The later second generation Lauson engines are impossible to accurately date.
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