Specifications Engine Model 425 Make Kawasaki Model Number FD620D-AS02 Horsepower 14.9 kW (20 hp) Cylinders Two Stroke/Cycle Four Displacement 617 cc (37.7 cu in) Bore 76 mm (2.99 in) Compression Ratio 9.0 Speed (fast idle), no load 3550 rpm Speed (slow idle), no load 1450 rpm Lubrication Full pressure Oil Filter Full flow (replaceable) Air Cleaner Replaceable element with pre-cleaner Cooling System Liquid-cooled Engine Model 445 Make Kawasaki Model Number FD620D-AS01 Horsepower 16.4 kW (22 hp) 128