Kahuku (Hi.) has won three consecutive Hawaii state titles and is an overwhelming favorite to make it four in a row this fall. Disaster nearly struck on the North Shore for the Red Raiders in their season-opener on Saturday, however. After failing to score in the first half, the preseason No. 25 team in the nation — per the Massey Ratings — managed to fight through its struggles on the road and defeat St. Louis (Hi.) in a 14-13 slog. Junior quarterback Troy Mariteragi threw a 25-yard touchdown to Noah Ah You early in the fourth quarter which proved to be the difference. St. Louis missed what w…