A two-stroke internal combustion engine comprising: a crankcase defining a crankcase chamber; a crankshaft disposed in the crankcase; a cylinder block connected to the crankcase, the cylinder block having an exhaust passage; a cylinder disposed in the cylinder block; a piston movably disposed within the cylinder and being operatively connected to the crankshaft; an exhaust valve assembly connected to the cylinder block comprising: a valve actuator having a first pressure chamber and a second pressure chamber, the first pressure chamber being adapted for selectively receiving one of a first pressure and a second pressure, the second pressure chamber being adapted for selectively receiving one of the first pressure and the second pressure, the first and second pressure chambers (100, 102) selectively fluidly communicating with the crankcase chamber; the first pressure being a positive pressure higher than the second pressure, the second pressure being one of: a negative pressure, and a second positive pressure; the crankcase chamber selectively supplying the first pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves toward the crankcase; and the crankcase chamber selectively supplying the second pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves away from the crankcase; and a valve operatively connected to the valve actuator, the valve actuator moving the valve between at least a first valve position and a second valve position, wherein in the first valve position, the valve extends in the exhaust passage and, in the second valve position, the valve is withdrawn from the exhaust passage, the valve actuator moving the valve to the first valve position when the first pressure is supplied to the first pressure chamber and the second pressure is supplied to the second pressure chamber, and the valve actuator moving the valve to the second valve position when the second pressure is supplied to the first pressure chamber and the first pressure is supplied to the second pressure chamber. a crankcase defining a crankcase chamber; a crankshaft disposed in the crankcase; a cylinder block connected to the crankcase, the cylinder block having an exhaust passage; a cylinder disposed in the cylinder block; a piston movably disposed within the cylinder and being operatively connected to the crankshaft; an exhaust valve assembly connected to the cylinder block comprising: a valve actuator having a first pressure chamber and a second pressure chamber, the first pressure chamber being adapted for selectively receiving one of a first pressure and a second pressure, the second pressure chamber being adapted for selectively receiving one of the first pressure and the second pressure, the first and second pressure chambers (100, 102) selectively fluidly communicating with the crankcase chamber; the first pressure being a positive pressure higher than the second pressure, the second pressure being one of: a negative pressure, and a second positive pressure; the crankcase chamber selectively supplying the first pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves toward the crankcase; and the crankcase chamber selectively supplying the second pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves away from the crankcase; and a valve actuator having a first pressure chamber and a second pressure chamber, the first pressure chamber being adapted for selectively receiving one of a first pressure and a second pressure, the second pressure chamber being adapted for selectively receiving one of the first pressure and the second pressure, the first and second pressure chambers (100, 102) selectively fluidly communicating with the crankcase chamber; the first pressure being a positive pressure higher than the second pressure, the second pressure being one of: a negative pressure, and a second positive pressure; the crankcase chamber selectively supplying the first pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves toward the crankcase; and the crankcase chamber selectively supplying the second pressure to at least one of the first and second pressure chambers (100, 102) as the piston moves away from the crankcase; and a valve operatively connected to the valve actuator, the valve actuator moving the valve between at least a first valve position and a second valve position, wherein in the first valve position, the valve extends in the exhaust passage and, in the second valve position, the valve is withdrawn from the exhaust passage, the valve actuator moving the valve to the first valve position when the first pressure is supplied to the first pressure chamber and the second pressure is supplied to the second pressure chamber, and the valve actuator moving the valve to the second valve position when the second pressure is supplied to the first pressure chamber and the first pressure is supplied to the second pressure chamber.