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Hello. My name is Tan.
Has the boat been sitting? If you push in on the key real quick will it idle? Does the use of the primer/choke help at all?
Ok usually poor idle is fuel related. Do you know what he has the idle timing set at. Usually this can be bumped up a little. There is no idle adjustment on the carbs so something is set up wrong. If he is adjusting the linkage to get the idle speed up the syncronization and linkage is out of adjustment. These engine should run with the carburetor plates completely closed.
Try the primer/choke. If it runs better then the idle tubes in the carbs are clogged still. If no change the idle timing and syncronization to be be adjusted.
Can't hurt. Usually if the idle tubes in the carbs are plugged real bad the carbs have to be cleaned in a ultrasonic carb cleaner.