520 Duty Classifications Recreational Performance Maximum recommendation: 1000 Nm (738 lb. ft.) of torque for diesel or gas applications. Maximum operation: 250 hours per year for planing type hulls of highly intermittent operation. Gross weight to horsepower less than 15.2 kg/kw (25 lbs./hp). T...

540Material/Manufacturing Specifications Bearings Taper roller bearings, spaced for optimum load carrying capabilities, support the shafts Castings Manufactured from high strength, heat treated aluminum Gears High strength heat treated alloy steel utilizing high performance marine technology Sha...

Konrad Marine Manufacturer of the World's Toughest Stern Drives Konrad Marine designs and manufactures stern drives for commerical, military, recreational and high performance applications. Since 1991, Konrad stern drives have been hard at work, worldwide, with proven reliability, strength, and perf...

540 Sterndrive The Konrad 540 is designed for medium performance applications. With its sleek lower gear case, the Konrad 540 will enhance the performance of both diesel and gasoline powered vessels with thicker walled castings, robust gears, bearings and shafts. The 540 sterndrive gives you the...

520 Installation/Operational Specifications Application Recreational or Commercial Engine Drive Shaft Mounting flange available for several types of transmissions Exhaust None through the sterndrive Gear Ratios 1.43:1, 1.57:1, 1.79:1, 2.0:1 Lubrication Full immersion, seven quarts with external ...