Re: Dhadley or seahorse!!! mechanic update!
See a knowledgable dealer as back in '86 and '87, like was posted previously, OMC had carb problems and changed out jets and carbs with those series of motors. For quite a few years at the annual service seminars, they gave out lists that showed carb numbers and jets that were OK to use with the motors. You'll have to find a dealer who has been in business for a while and keeps good records of the service literature.