Marine propulsion device and marine vessel

A marine vessel comprising:

• a hull;
• and
• a marine propulsion device provided on the hull and including:
• an engine;
• a rev-up detector to detect a sudden increase in an engine rotation speed;
• and
• a controller configured or programmed to perform a control to suppress the engine rotation speed;
• wherein
• the controller is configured or programmed to:
• perform an initial misfire control to determine whether or not a cylinder of the engine is to be misfired in order to suppress the engine rotation speed when it is determined that an initial sudden increase in the engine rotation speed that causes over-revving has occurred based on a detection result from the rev-up detector, and to misfire the cylinder in the initial misfire control when it is determined that the cylinder is to be misfired;
• and
• perform a subsequent misfire control to determine whether or not the cylinder is to be misfired in order to suppress the engine rotation speed when it is determined that a subsequent sudden increase in the engine rotation speed that causes the over-revving has occurred following the initial sudden increase in the engine rotation speed based on the detection result from the rev-up detector, and to misfire the cylinder in the subsequent misfire control when it is determined that the cylinder is to be misfired.