To enable the smooth shifting operation by lowering the revolution when a throttle valve is full closed and the revolution is not less than the specified revolution after the specified laps of time.
A revolution control means 100 for lowering the revolution when a throttle valve is full closed and the revolution is not less than the specified revolution after the specified time passes is provided on an engine control unit 42 of an outboard motor. The revolution control means 100 lowers the revolution by full closing an idle air adjusting valve 62 provided on a bypass passage for communicating the upstream of the throttle value with the downstream of the throttle valve on the basis of revolution information from an engine speed sensor 43. Thereafter, even if the revolution becomes the specified revolution or more, either a forward bevel gear or a reverse bevel gear of a forward/reverse selecting device is connected to a propulsion shaft, or both of them are not connected to it, and the shifting operation can be smoothly performed. The revolution control means 100 controls an ignition device 101 to delay the ignition timing, the thinned-out ignition or the ignition of any one of cylinders are stopped to easily and reliably lower the revolution.
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