Here are some Photos, Sorry about the Abysmal Quality though.. These are stills from a Microfiche Real of Old Sears Catalogs..

This is the first appearance Spring of 1980
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Also Spring '80 This is the Style of Cover I'm Talking about.
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Here is a Petrol One with Covers.. This used a Mach 3 Engine which was a 2 Stroke Rebadged "Eager 2" The 2 Obviously being for 2 Stroke. This was Summer '82
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Then In 1983 This is the last time we see them.. They are then replaced by the Boxy AYP Mowers that sears still sells today..
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Kori laugh