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An engine system may include a fuel and air supply circuit and an exhaust circuit, a temperature sensor mounted on an exterior of the engine and an oxygen sensor located in the exhaust circuit. The fuel and air supply circuit may include a throttle body mounted on the engine and having a throttle va

An engine system may include a fuel and air supply circuit and an exhaust circuit, a temperature sensor mounted on an exterior of the engine and an oxygen sensor located in the exhaust circuit. The fuel and air supply circuit may include a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine, a fuel injector carried by the throttle body to deliver fuel to the engine and a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector. An engine control unit may be communicated with these components to control the fuel and air mixture provided to the engine as a function of the temperature and oxygen sensor outputs.

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1. An engine system, comprising: an engine having a fuel and air supply circuit and an exhaust circuit;a temperature sensor mounted on an exterior of the engine;an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases;a

1. An engine system, comprising: an engine having a fuel and air supply circuit and an exhaust circuit;a temperature sensor mounted on an exterior of the engine;an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases;a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine;a fuel injector carried by the throttle body to deliver fuel to the engine;a fuel rail carried by at least one of the throttle body and the fuel injector and having an inlet to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector;the fuel rail is rotatably carried by the throttle body and includes an anti-rotation feature to retain a desired position of the fuel rail in assembly; andan engine control unit communicated with the temperature sensor, the oxygen sensor, the throttle valve and the fuel injector to control the fuel and air mixture provided to the engine as a function of the temperature sensor output and the oxygen sensor output. 2. The engine system of claim 1 wherein the engine includes an engine speed sensor and the engine control unit is communicated with the engine speed sensor to control the fuel and air mixture provided to the engine as a function of the engine speed sensor output. 3. The engine system of claim 2 which also comprises an ignition unit mounted on or adjacent to the engine and including an ignition coil and a driver circuit adapted to control generation of an ignition signal by the ignition coil where the ignition signal is communicated with a spark plug to cause the spark plug to generate a spark. 4. The engine system of claim 3 wherein the driver circuit is communicated with the engine control unit so that the driver circuit drives the ignition coil as a function of the output of the engine speed sensor. 5. The engine system of claim 1 wherein the engine includes at least one cooling fin and the temperature sensor is mounted on the cooling fin. 6. The engine system of claim 5 wherein the temperature sensor is retained on the cooling fin by a clip that is secured to the engine without having to form any void in the engine. 7. The engine system of claim 1 wherein the temperature sensor is retained on the engine by a clip that is secured to the engine without having to form any void in the engine. 8. The engine system of claim 1 wherein the throttle body comprises: a main body including a throttle bore through which air is delivered to the engine;the throttle valve is carried by the throttle body and movable between a first position substantially restricting air flow from the throttle bore and a second position permitting a greater flow rate of air from the throttle bore than the first position;the fuel rail is carried by the throttle body so that the fuel rail can be oriented in a plurality of positions relative to the throttle body; anda retainer that secures the fuel rail to the throttle body and retains a desired orientation of the fuel rail. 9. The engine system of claim 8 which further comprises a throttle position sensor carried by the throttle body to provide an output signal indicative of the position of the throttle valve. 10. The engine system of claim 9 wherein the throttle position sensor includes a magnet carried by the throttle valve and a sensor element spaced from the magnet and responsive to the magnetic field of the magnet. 11. The engine system of claim 10 wherein the engine control unit is carried by the throttle body and wherein the sensor element is carried by the engine control unit. 12. The engine system of claim 8 wherein the fuel rail includes one or more anti-rotation features engageable by the retainer to inhibit rotation of the fuel rail. 13. The engine system of claim 12 wherein the anti-rotation features include a plurality of flat surfaces formed about a periphery of the fuel rail. 14. The engine system of claim 8 wherein the fuel injector includes an inlet in communication with the outlet of the fuel rail and an outlet communicated with the engine. 15. An engine system, comprising: an engine having a fuel and air supply circuit, an exhaust circuit and one or more cooling fins integrally formed on at least part of the main body;a temperature sensor mounted on an exterior of the engine, coupled to a cooling fin by direct engagement of a portion of the temperature sensor with the cooling fin and without requiring any void formed in the cooling fin;a resilient clip having a first portion overlying part of the temperature sensor and a second portion overlying the cooling fin to trap the temperature sensor against the cooling fin under a compressive force;an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases;a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine;a fuel injector carried by the throttle body to deliver fuel to the engine;a fuel rail carried by at least one of the throttle body and the fuel injector and having an inlet to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector; andan engine control unit communicated with the temperature sensor, the oxygen sensor, the throttle valve and the fuel injector to control the fuel and air mixture provided to the engine as a function of the temperature sensor output and the oxygen sensor output. 16. The engine system of claim 15 wherein the temperature sensor includes lead wires connected at a junction and a cover disposed over the junction. 17. The engine system of claim 16 wherein the cover includes a planar surface disposed on the cooling fin and the clip holds the planar surface flush against the cooling fin. 18. An engine system, comprising: an engine having a fuel and air supply circuit and an exhaust circuit;a temperature sensor mounted on an exterior of the engine;an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases;a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine;a fuel injector carried by the throttle body to deliver fuel to the engine;a fuel rail rotatably carried by at least one of the throttle body and the fuel injector and having an inlet to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector;an anti-rotation feature retaining a desired position of the fuel rail in assembly; andan engine control unit communicated with the temperature sensor, the oxygen sensor, the throttle valve and the fuel injector to control the fuel and air mixture provided to the engine as a function of the temperature sensor output and the oxygen sensor output.