A power cutter comprising: a housing 2; an engine 24 mounted within the housing 2; a support arm 7 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
liquid fuel aeration mechanism 126 to generate aerated fuel for the engine; an air intake 314 for the provision of air for the
liquid fuel aeration device 126; an
air filtration mechanism 316 to filter the air drawn in from the air intake for the
liquid fuel aeration mechanism; a
fuel tank 124 for providing fuel to the liquid fuel aeration mechanism; and an exhaust 146 through which the exhaust gases generated by the operation of the engine are expelled; wherein the
air filtration mechanism comprises an
air filter 320 comprising a plurality of pleats and wherein the
air filtration mechanism further comprises an
air filter cleaning mechanism comprising a moveable
pleat stroker 328; 342; 420 located adjacent the
air filter 320 and which is capable of being moved over the pleats of the air filter 320, and which, when moved over the pleats, engages with the pleats and causes the pleats to flex in order to knock any dust trapped on the pleats, off the pleats.