A throttle assembly for an engine includes a remote control throttle lever, a manual throttle control lever, and a throttle return spring. The remote control throttle lever is configured to operate the throttle assembly and the engine based on a force received from an external device. The manual throttle control lever is configured to operate the throttle assembly and the engine based on a force received from a user input at an input portion of the manual throttle control lever. An abutment portion of the manual throttle control lever is spaced from the input portion of the manual throttle control lever and configured to abut the remote control throttle lever. The throttle return spring is configured to bias the remote control throttle lever against the abutment portion of the manual throttle control lever in an opposite direction of the force received from the external device.

A throttle assembly for an engine includes a remote control throttle lever, a manual throttle control lever, and a throttle return spring. The remote control throttle lever is configured to operate the throttle assembly and the engine based on a force received from an external device. The manual throttle control lever is configured to operate the throttle assembly and the engine based on a force received from a user input at an input portion of the manual throttle control lever. An abutment portion of the manual throttle control lever is spaced from the input portion of the manual throttle control lever and configured to abut the remote control throttle lever. The throttle return spring is configured to bias the remote control throttle lever against the abutment portion of the manual throttle control lever in an opposite direction of the force received from the external device.

A throttle valve assembly includes a valve housing having a main channel and an auxiliary channel. A main throttle valve is pivotally mounted in the main channel, and an auxiliary throttle valve pivotally is mounted in the auxiliary channel. A common rotating actuator controls the opening angle of both the main throttle valve and the auxiliary throttle valve through an actuating mechanism. The actuating mechanism includes a crank mechanism connected between an auxiliary pivoting shaft and a gear train driven by the rotating actuator.