About the HAYTER Harrier 48 VS Petrol Lawnmower (474B). HAYTER Harrier 48 VS Petrol Lawnmower (474B) Technical Information. Engine model: Hayter 159 cc OHV. This self-propelled mower allows you to mow comfortably at your own pace, with variable speeds ranging from 2.1 to 3.3 mph.
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