Abstract: Starting device for an internal combustion engine including a rope pulley (10), a freewheel coupling having a driving coupling part on the pulley, and a driven coupling part on a flywheel of the engine. The driving coupling part includes a ratchet wheel (14) and the driven coupling part includes a movable pawl (18) adapted to engage the ratchet wheel. The ratchet wheel is frusto-conical and has its relatively smaller diameter end facing the flywheel. An outer leg of the pawl is angled to correspond to the taper or cone angle of the ratchet wheel.

Abstract: An inlet tube (13) for interconnecting a carbureter (11) and an inlet pipe socket (12) of an internal combustion engine, especially in a motor saw, is made of a flexible material and provided with a bellows (16) for allowing relative movement between the carbureter and the engine. In order to prevent accumulation of fuel in the bellows, a telescopically slidable tube piece (17) is provided radially inside the bellows. The tube piece has an outer sealing surface cooperating with a complementary, surrounding sealing surface of the inlet pipe socket (12) in order to isolate the bellows from the interior of the inlet tube. The bellows is arranged adjacent to the intake pipe socket (12) in order to evaporate any liquid fuel accumulated in the bellows by heat supplied by said intake pipe socket.

Abstract: A muffler, especially for an internal combustion engine of a chain saw, comprises a primary and a secondary chamber through which exhaust gases from the engine in turn flow. The primary chamber (10) is formed by an inner, generally spherical receptacle (11) which is surrounded by an outer receptacle (12), and the secondary chamber (13) is formed by the space between the receptacles. The dimensions of the receptacles are such that the volumes of the chambers are generally equal.

Abstract: In a two-cycle engine provided with crankshaft controlled fuel injection, fuel is supplied from a fuel tank to an inlet (23) having an adjusting means. The fuel flows via a connection (27) to a passage (39) in the crankshaft (13). Gaskets and O-rings are provided to seal off against the crankshaft and crankcase. The positions of the connection (27) and the crankshaft passage (39) are selected so as to obtain communication when underpressure prevails in the crankcase whereby fuel is sucked in and thrown out by centrifugal force via a nozzle (31).