Abstract: A holding structure for holding a device on a fuel tank can be manufactured by small man-hours, and is simple in construction and excellent in vibration isolating performance. The holding structure holds a device (11) inserted in a fuel tank (10) on the fuel tank (10). The holding structure includes a holding tube (19) formed integrally with the fuel tank (10) so as to surround an opening (18) formed in the fuel tank (10), an elastic boot (21) put on the holding tube (19) so as to be in close contact with the outer circumference (19a) of the holding tube (19) and the outer circumference (15a) of a part of the device (11), extending outside from the holding tube (19), and a fastening device (22, 23) for fastening the elastic boot (21) to the respective outer circumferences (19a, 15a) of the holding tube (19) and the device (11).

Abstract: A holding structure for holding a device on a fuel tank can be manufactured by small man-hours, and is simple in construction and excellent in vibration isolating performance. The holding structure holds a device (11) inserted in a fuel tank (10) on the fuel tank (10). The holding structure includes a holding tube (19) formed integrally with the fuel tank (10) so as to surround an opening (18) formed in the fuel tank (10), an elastic boot (21) put on the holding tube (19) so as to be in close contact with the outer circumference (19a) of the holding tube (19) and the outer circumference (15a) of a part of the device (11), extending outside from the holding tube (19), and a fastening device (22, 23) for fastening the elastic boot (21) to the respective outer circumferences (19a, 15a) of the holding tube (19) and the device (11).

Abstract: A reed valve for opening and closing an intake passage of an engine includes a valve body having a valve hole and a valve seat, and a reed piece made of a resin. The reed piece has a base end of which is supported by the valve body so as to be seated on a valve seat surface of the valve seat. An elongated member is formed on the valve body so as to extend across the valve hole. The outer surface of the elongated member lies in a plane including the valve seat surface. According to the present invention having the above described structure, bending deformation of the reed piece at the closed state can be deterred.

Abstract: An exhaust apparatus for an engine is provided, which is capable of efficiently sucking in secondary air for a catalyst by utilizing an ejector (entraining) effect caused by the exhaust gases and which has a simple and inexpensive structure. Exhaust gases from the engine are introduced into a main muffler body, are expanded and muffled by passage through a plurality of silencer chambers, and are also passed through a catalyst and scrubbed thereby in a state in which they are mixed with secondary air introduced from the exterior. A secondary air introduction pipe for introducing secondary air is provided in a first-stage silencer chamber. A mixing pipe is provided into which are introduced the secondary air introduced from the secondary air introduction pipe and the exhaust gases from the first-stage silencer chamber.

Abstract: An exhaust port is formed in the wall of a cylinder of a 2-cycle engine. At least one of the portions of the cylinder wall which define two vertically opposing edges of the exhaust port is projected at the circumferentially mid portion towards the opposing edge so as to provide a piston guide surface which conforms with the inner peripheral surface of the cylinder and which extends in such a manner as to reduce the axial height of the exhaust port. The piston guide surface serves to suppress vibration and noise caused when an upwardly moving piston falls into the exhaust port.