An internal combustion engine comprising: a plurality of combustion cylinders; an intake air system for supplying air to the combustion cylinders; an exhaust gas system fluidly connected to the combustion cylinders, the exhaust gas system including an exhaust manifold, an exhaust gas outlet, and an exhaust restriction valve for controlling flow of exhaust gas from the exhaust manifold to the exhaust gas outlet, the exhaust restriction valve (26; 80) including: a body with a bore through which exhaust gas may flow, a valve member within the bore for restricting flow through the bore, the valve member being movable from a first open position at which flow through the bore is substantially unrestricted by the valve member towards a second closed position at which flow through the bore is substantially blocked, and a stop to prevent the valve member from moving to the second closed position, the stop defining a fixed third restricted flow position with the valve member positioned between the first open position and the second closed position, the stop including a pin extending into the bore to block movement of the valve member by engaging the valve member at the third restricted flow position to prevent movement of the valve member to the second closed position, the pin being fixed within a portion of the body of the exhaust restriction valve (26; 80) to define the third restricted flow position; and an exhaust gas recirculation system for recirculating exhaust gas from the exhaust gas system to the intake air system, the exhaust gas recirculation system including an exhaust gas recirculation control valve for controlling flow of exhaust gas from the exhaust manifold to the intake air system. a plurality of combustion cylinders; an intake air system for supplying air to the combustion cylinders; an exhaust gas system fluidly connected to the combustion cylinders, the exhaust gas system including an exhaust manifold, an exhaust gas outlet, and an exhaust restriction valve for controlling flow of exhaust gas from the exhaust manifold to the exhaust gas outlet, the exhaust restriction valve (26; 80) including: a body with a bore through which exhaust gas may flow, a valve member within the bore for restricting flow through the bore, the valve member being movable from a first open position at which flow through the bore is substantially unrestricted by the valve member towards a second closed position at which flow through the bore is substantially blocked, and a stop to prevent the valve member from moving to the second closed position, the stop defining a fixed third restricted flow position with the valve member positioned between the first open position and the second closed position, the stop including a pin extending into the bore to block movement of the valve member by engaging the valve member at the third restricted flow position to prevent movement of the valve member to the second closed position, the pin being fixed within a portion of the body of the exhaust restriction valve (26; 80) to define the third restricted flow position; and a body with a bore through which exhaust gas may flow, a valve member within the bore for restricting flow through the bore, the valve member being movable from a first open position at which flow through the bore is substantially unrestricted by the valve member towards a second closed position at which flow through the bore is substantially blocked, and a stop to prevent the valve member from moving to the second closed position, the stop defining a fixed third restricted flow position with the valve member positioned between the first open position and the second closed position, the stop including a pin extending into the bore to block movement of the valve member by engaging the valve member at the third restricted flow position to prevent movement of the valve member to the second closed position, the pin being fixed within a portion of the body of the exhaust restriction valve (26; 80) to define the third restricted flow position; and an exhaust gas recirculation system for recirculating exhaust gas from the exhaust gas system to the intake air system, the exhaust gas recirculation system including an exhaust gas recirculation control valve for controlling flow of exhaust gas from the exhaust manifold to the intake air system.