HALF MOON BAY, CALIF. -- It's midmorning of a cool May day on the California coast. Standing amid rolling fairways and tightly trimmed greens, entrepreneurs Jared and Brooke Zaugg are basking in the glory of their creation, not a golf tournament but a celebration of machinery. Today the Ocean Course links, wrapped around the Ritz-Carlton hotel at Half Moon Bay, are home to the third annual Legend of the Motorcycle Concours d'Elegance.Undeterred by the overcast sky, fans stream across the 18th fairway to get a close look at hundreds of antique bikes that have been polished and primed by their...