Mercury Hurricane KG4H racing engine.

outboard engine

Mercury Hurricane gasoline outboard KG4H, racing engine, 7.5 HP, 2 cylinder, 15 cubic inches, used on Class A/B Utility outboard 89.33.1; cast number "ME 3944"; Hydro short lower unit, one to one gear ratio; operating rpm 5,000 to 7,000 rpm; fuel mixture 3/4 pint oil per gallon gas; approx. 15 miles per gallon; forged crank shaft and connecting rods, all roller bearings throughout.