Yamaha 200-250 Horsepower Magnesium Anode Kit MAR-1124M-GK-T0. Overview. The Yamaha 200-250 Horsepower Magnesium Anode Kit MAR-1124M-GK-T0 is a genuine original equipment manufacturer solution designed to protect your outboard engine from corrosion caused by electrolysis. This kit includes sacrificial anodes that are engineered to corrode in place of critical engine components, helping extend the life of your engine and maintain reliable performance.. Anodes are essential for protecting metal pa