Described is an acceptor/adapter device for securing an outboard jet motor to a watercraft. The acceptor/adapter comprises a shrouded opening for communication with an intake of the outboard jet motor. Sidewalls of the acceptor/adapter device can form a tunnel, wherein the tunnel is configured for directing a flow of water through the tunnel, into the adapter/acceptor device, and into the intake of the outboard jet motor. Also described is a hull with a tunnel for directing a flow of water to an intake of an outboard jet motor, as well as a directional device which allows for vertical or horizontal adjustments to the jet output or reversing the jet output.

A marine propulsion system includes a main propulsion device including a main thruster, an auxiliary propulsion device to be attached to a stern on one side of a centerline of a hull in a right-left direction and including an auxiliary thruster, and a remote control lever to switch between a neutral state, a forward movement state, and a reverse movement state. The auxiliary propulsion device further includes a tilt device to tilt up and tilt down an auxiliary propulsion device body, and is operable to tilt up the auxiliary propulsion device body with the tilt device when the main propulsion device is switched from the neutral state to the forward movement state by the remote control lever while the auxiliary propulsion device body is tilted down.

A marine propulsion system includes a main propulsion device including a main thruster, an auxiliary propulsion device to be attached to a stern on one side of a centerline of a hull in a right-left direction and including an auxiliary thruster, and a remote control lever to switch between a neutral state, a forward movement state, and a reverse movement state. The auxiliary propulsion device further includes a tilt device to tilt up and tilt down an auxiliary propulsion device body, and is operable to tilt up the auxiliary propulsion device body with the tilt device when the main propulsion device is switched from the neutral state to the forward movement state by the remote control lever while the auxiliary propulsion device body is tilted down.

A marine propulsion system includes a controller configured or programmed to perform an electric drive control to cause an electric motor to drive an auxiliary thruster in an auxiliary propulsion device and having a minimum output smaller than a minimum output of a main thruster without performing an engine drive control to cause an engine to drive the main thruster in a main propulsion device when adjusting a thrust of a marine vessel to less than a troll thrust.

A marine propulsion system includes a controller configured or programmed to perform an electric drive control to cause an electric motor to drive an auxiliary thruster in an auxiliary propulsion device and having a minimum output smaller than a minimum output of a main thruster without performing an engine drive control to cause an engine to drive the main thruster in a main propulsion device when adjusting a thrust of a marine vessel to less than a troll thrust.

Engine includes: crankcase housing crankshaft extending in vertical direction; cylinder block mounted on side of crankcase and formed with cylinder; cylinder head mounted on side of cylinder block and provided with air inlet port and air outlet port communicating with cylinder; cylinder head cover mounted on side of cylinder head and covering air inlet port and air outlet port; mount case including: supporting portion provided below crankcase and cylinder block and supporting crankcase and cylinder block; and extending portion extending from supporting portion below cylinder head and cylinder head cover; oil pan provided below mount case and storing lubricating oil; and communication tube communicating first space formed between cylinder head and cylinder head cover and second space formed between mount case and oil pan. Communication tube is provided between cylinder head cover and extending portion.

Engine includes: crankcase housing crankshaft extending in vertical direction; cylinder block mounted on side of crankcase and formed with cylinder; cylinder head mounted on side of cylinder block and provided with air inlet port and air outlet port communicating with cylinder; cylinder head cover mounted on side of cylinder head and covering air inlet port and air outlet port; mount case including: supporting portion provided below crankcase and cylinder block and supporting crankcase and cylinder block; and extending portion extending from supporting portion below cylinder head and cylinder head cover; oil pan provided below mount case and storing lubricating oil; and communication tube communicating first space formed between cylinder head and cylinder head cover and second space formed between mount case and oil pan. Communication tube is provided between cylinder head cover and extending portion.

A wireless voice controlled system for a trolling motor assembly which enables fully automatic usage of the trolling motor assembly in different modes of operation, including automatic voice controlled storage/locking of the trolling motor assembly at the boat base, launching the trolling motor assembly from a horizontal/storage position to a vertical position for operation in water, locking the trolling motor assembly in the vertical position, and retrieving the trolling motor back to a horizontal/storage/lock position on the bow mounted base using voice commands entered by a boat operator in a microphone on a wireless command transmitter. The system enables the boat operator to control the steering of the trolling motor and speed of the propeller for the boat propulsion using voice commands transmitted wirelessly from the handheld (or stationary) wireless command transmitter to a receiver embedded in a positioning and operation control unit having a logic and mechanical drive mechanism for transitioning the trolling motor assembly into any desired mode of operation and controlling the operation of the motor.

A jet pump assembly includes a marine engine, a jet drive and a shield adapted to be secured to a transom of a watercraft. The shield has arms to which the marine engine is secured and legs to which an intake mount is secured. The jet drive is supported by the intake mount. The shield has at least one flange adapted to be secured to a middle toon of a pontoon boat. The shield covers an opening in the middle toon through which the marine engine is passed during assembly. A gasket between the shield and opening prevents water from entering the middle toon.

A jet pump assembly includes a marine engine, a jet drive and a shield adapted to be secured to a transom of a watercraft. The shield has arms to which the marine engine is secured and legs to which the jet drive is secured, the arms and legs extending in opposite directions. The shield has a flange adapted to be secured to the transom of the watercraft. The shield covers an opening in the transom through which the jet pump assembly is passed during assembly. A gasket between the shield and transom prevents water from entering the watercraft.