About 4.5 HP Johnson Outboard Motors

Written by mandy slake
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Johnson makes outboards in a variety of sizes and horsepower ratings. They only made a 4.5 horsepower motor for a short time in the mid-1930s. Later models were either 4.2 or 5.0 horsepower.

Years in Production

Johnson produced 4.5 horsepower motors from 1935 to 1937.

Model Numbers

The 1935 model was the A-75, the 1936 model was the A-80 and the 1937 model was the AA-37. The A-75 used a 25-280 model propeller drive pin, while the A-80 used a 25-286, and the AA-37 used a 13-40.

Common Specifications

These motors all had 7 pint gas tanks. They each weighed 21.8 Kilogram and used Champion 5M model spark plugs. The original list price for all three models was £94. All three models were 1.5 stroke engines with a 1 and 7/8-inch bore, and a maximum RPM of 4,000.

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