A power cutter comprising: a housing; a two stroke internal combustion engine mounted within the housing; a throttle switch by which the engine can be accelerated when the engine is running; a support arm mounted on the housing and which projects forward of the housing; a blade mounting mechanism (70, 90, 86, 92) rotatably mounted on the end of the support arm and which is capable of being rotationally driven by the engine 24 when the engine is running; a carburetor for providing aerated petrol for the engine, the carburetor capable of operating in at least two modes of operation, a first mode when the engine is cold and a second mode when the engine is hot; an air intake for providing air for the carburetor; an air filtration mechanism to filter the air drawn in from the air intake for the carburetor; a petrol tank for providing petrol to the carburetor; and an exhaust through which the exhaust gases generated by the operation of the engine are expelled from the engine; an electronic controller which controls the operation of the engine; and an electrical power supply (706, 708) for powering the electrical components of the power cutter; wherein there is provided a temperature sensor mounted on the engine and which provides the engine controller with a signal which is a function of the temperature of the engine; the carburetor comprising an electrically controlled cold start mechanism which switches the carburetor between its two modes of operation, wherein, when the electronic controller determines that the engine is cold, it provides an electrical signal to the electrically controlled cold start mechanism to cause it to change the mode of operation of the carburetor to its first mode; characterised in that there is provided an oil tank for providing lubricating oil for the engine and an electrically powered oil pump to pump lubricating oil from the oil tank to mix it with petrol, the electrical power to the oil pump being controlled by the electronic controller, wherein, when the carburetor is operating in its first mode of operation, the electronic controller switches the electrical power to the oil pump off to reduce the amount of power drawn from the electrical power supply (706, 708). a housing; a two stroke internal combustion engine mounted within the housing; a throttle switch by which the engine can be accelerated when the engine is running; a support arm mounted on the housing and which projects forward of the housing; a blade mounting mechanism (70, 90, 86, 92) rotatably mounted on the end of the support arm and which is capable of being rotationally driven by the engine 24 when the engine is running; a carburetor for providing aerated petrol for the engine, the carburetor capable of operating in at least two modes of operation, a first mode when the engine is cold and a second mode when the engine is hot; an air intake for providing air for the carburetor; an air filtration mechanism to filter the air drawn in from the air intake for the carburetor; a petrol tank for providing petrol to the carburetor; and an exhaust through which the exhaust gases generated by the operation of the engine are expelled from the engine; an electronic controller which controls the operation of the engine; and an electrical power supply (706, 708) for powering the electrical components of the power cutter; wherein there is provided a temperature sensor mounted on the engine and which provides the engine controller with a signal which is a function of the temperature of the engine; the carburetor comprising an electrically controlled cold start mechanism which switches the carburetor between its two modes of operation, wherein, when the electronic controller determines that the engine is cold, it provides an electrical signal to the electrically controlled cold start mechanism to cause it to change the mode of operation of the carburetor to its first mode; characterised in that there is provided an oil tank for providing lubricating oil for the engine and an electrically powered oil pump to pump lubricating oil from the oil tank to mix it with petrol, the electrical power to the oil pump being controlled by the electronic controller, wherein, when the carburetor is operating in its first mode of operation, the electronic controller switches the electrical power to the oil pump off to reduce the amount of power drawn from the electrical power supply (706, 708).