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From the serial number you have listed it is a 590.
Engine horsepower is not listed.
Engine Type Horizontal In-line
Engine Stroke 4-Stroke
Valve Configuration OHV
Displacement (cc/ci) 586 / 35.7
Wheelbase (in/mm) 72.8 / 1860
Dry Weight (lbs/kg) 1270 / 576
Fuel Capacity (gal/l) 7.4 / 28