Mercury - MerCruiser Alpha One Gen II 300 Hour Maintenance Kit Precision Sterndrive Service Kit Marine-Ready Components 8M0147073. Overview. Boaters who run a MerCruiser Alpha One Gen II sterndrive know the feeling of depending on gear that's built to last. There's a steady confidence that comes from hearing that familiar shift into gear, or feeling the boat glide onto plane without hesitation. But even the toughest drive needs regular care to keep performing the way it always has. The Mercury M