My son has a 1997, Merc, 60hp, 3 cyl.,on a 16.6 ft. Flats & Bay. The boat runs great at 5500 rpm, 40 mph but then very abruptly losses power<br /> and falls of plane. From that point on attaininmg full speed is very intermittent. When advancing the throttle the engine boogs. We have replaced...
