[bigshrimpin]

Check the plugs first . . . Read the ceramic material . . . should be paper bag brown. There are some good resources online for reading spark plugs.

If they look "ok" . . . Is the engine surging? loosen fuel pump mounting screws and squeeze the primer bulb and see if fuel is weeping out the fuel pumps. if yes replace fuel pumps.

To eliminate the carbs: Take the airbox cover off the carbs and have someone drive the boat at WOT. Look down the throat of each carb. There should be a nice fan shaped spray of fuel in each carbs - venturi. If one of the fans is significantly less than the other . . . then limp home slowly and rebuild (clean) the carbs .