Abstract: A recoil starter has a guide surface with limited polar symmetry about the axis of the pull-rope limiting rotational orientation of the pull-handle in the at-rest position to less than three angular positions.

Abstract: An internal combustion engine includes a cylinder block journaling a crankshaft driven to rotate by a reciprocal piston, and a cylinder head having intake and exhaust passages for delivering a combustible fuel-air mixture to drive the piston and for exhausting the combustion products thereof, respectively. The cylinder block and the cylinder head are a single unitary monoblock member without opposing machined surfaces and a head gasket therebetween.

Abstract: A piston is arranged within a cylinder so as to be movable upwardly and downwardly, a fuel injector is provided at a cylinder head of the cylinder to directly inject fuel into a combustion chamber in the cylinder, and mixture of fuel and air in the combustion chamber is ignited by a spark plug provided at the cylinder head. Scavenging paths and an exhaust port are provided in the cylinder so as to perform scavenging of the combustion chamber and perform exhausting when the piston is moved downwardly by combustion of the mixture. A top portion of the piston is provided with a convex portion with an inclination surface of which inclination extends in a direction of the top portion of the cylinder from an outer periphery of the piston towards a central portion side.

Abstract: An ignition apparatus which determines ignition timing corresponding to the running state of an internal combustion engine. Ignition timing is advanced for a period when a choke switch 21 used for improving startability of the engine at a low temperature is closed, and for a predetermined period after the choke switch is opened as determined by the time constant of an RC circuit. When the predetermined period passes after the choke switch is opened, the ignition timing is delayed to a characteristic suitable for the running of the engine after warm up.

Abstract: A two-cycle internal combustion engine capable of improving its output and a rate of feed consumption. In the engine, an ignition plug is so disposed that its tip end is arranged in a top chamber and positioned on a vertical plane extending through the top chamber and a partition is provided in a region of the top chamber apart from the ignition plug in a manner to extend substantially along the vertical plane from one end of the top chamber by a distance toward the ignition plug, to thereby divide the region into two compartments. The partition cooperates with the top chamber to form corners to both sides of the one end of the top chamber with the partition being interposed therebetween so that they may serve to direct fuel gas supplied to the top chamber toward the ignition plug.

Abstract: An apparatus for controlling a plurality of driving units comprises a lever device pivotable to operate each driving unit, and a switch device having a plurality of switches each for changing the position of a driving portion of each driving unit. The switch device is disposed in the lever device such that the lever device and thed plurality of switches are simultaneously manually operated.