A walk behind powered apparatus having a mobile structure, a work implement drive system coupled to the mobile structure, a power device driving the work implement, and a handle structure coupled to the mobile structure. The handle structure includes a cam slot having a first portion and a second portion. The second portion is orthogonal to the first portion. A bail member is pivotally coupled to the handle structure and includes a pin extending therefrom. The pin cammingly engaging the slot such that when the bail member is in a first position the pin is disposed in the first portion of the slot and when the bail member is in a second position the pin is disposed in the second portion of the slot. A switch device is coupled to the work implement drive system and selectively actuates the work implement drive system in response to the movement of the bail member between the first position and the second position. A biasing member biases the bail member into the first position to prevent inadvertent actuation of the switch device.