Abstract: A recoil starter (103) includes a pull rope reel (22), a ratchet wheel (31), a pulley (32), a ratchet pawl (33), and an outer wall (32e). The ratchet pawl (33) is capable of swinging between an engaged position where the ratchet pawl engages with a protruding part (31a) and a disengaged position where the ratchet pawl does not engage with the protruding part, and is always urged toward the engaged position. A support surface (32d) of the outer wall (32e) supports the base end portion of the ratchet pawl (33) when the ratchet pawl (33) is in the engaged position. The internal space of the pulley (32) and the external space of the pulley (32) are communicate with each other through the foreign matter discharge portion (32f) of the outer wall (32e).

Abstract: A recoil starter (103) includes a pull rope reel (22), a ratchet wheel (31), a pulley (32), a ratchet pawl (33), and an outer wall (32e). The ratchet pawl (33) is capable of swinging between an engaged position where the ratchet pawl engages with a protruding part (31a) and a disengaged position where the ratchet pawl does not engage with the protruding part, and is always urged toward the engaged position. A support surface (32d) of the outer wall (32e) supports the base end portion of the ratchet pawl (33) when the ratchet pawl (33) is in the engaged position. The internal space of the pulley (32) and the external space of the pulley (32) are communicate with each other through the foreign matter discharge portion (32f) of the outer wall (32e).

Abstract: A forced-air-cooled engine has a main blow-out opening provided to a back plate of a cooling fan cover at a position facing a cylinder part for blowing out cooling air for cooling a cylinder part and a secondary blow-out opening provided to the back plate at a position opposite to the main blow-out opening in regard to the crankshaft center for cooling a part of a crankcase part, wherein a cooling air guide cover is equipped which is composed of a cylinder air-guide cover part which guides air blown out from the main blow-out opening to flow to cool the cylinder part and cylinder head, and a top cover part which guides air blown out from the secondary blow-out opening to flow along a side face of the crankcase part to cool there and then flow into midstream of the cooling air flow blown out from the main blow-out opening and cooling the cylinder part and cylinder head.

Abstract: A structure of crankcase-integrated cylinder block for a small internal combustion engine is posed to increase strength and rigidity in order to reduce particularly vibration and noise. A cylinder part and a crankcase part are formed into a box-like shape being cast in one piece, a crankcase cover is fixed to the crankcase part to cover an opening on a side in anteroposterior thereof, a crankshaft bearing boss has a crankshaft bearing hole being provided at a central part of a back wall of the crankcase part to protrude to both inner and outer sides of the back wall for supporting an end sides of a crankshaft, wherein an inner peripheral rib is formed along the corner where the back wall of said crankcase part connects to a peripheral wall extending from the periphery of the back wall to heave inward form the corner part.

Abstract: The invention provides a method and construction of vibration control supporting a cooling fan cover.

Abstract: A structure of crankcase-integrated cylinder block for a small internal combustion engine is posed to increase strength and rigidity in order to reduce particularly vibration and noise. A cylinder part and a crankcase part are formed into a box-like shape being cast in one piece, a crankcase cover is fixed to the crankcase part to cover an opening on a side in anteroposterior thereof, a crankshaft bearing boss has a crankshaft bearing hole being provided at a central part of a back wall of the crankcase part to protrude to both inner and outer sides of the back wall for supporting an end sides of a crankshaft, wherein an inner peripheral rib is formed along the corner where said back wall of said crankcase part connects to a peripheral wall extending from the periphery of said back wall to heave inward form said corner part.

Abstract: The invention provides a method and construction of vibration control supporting a cooling fan cover.

Abstract: A forced-air-cooled engine having a main blow-out opening provided to a back plate of a cooling fan cover at a position facing a cylinder part for blowing out cooling air for cooling a cylinder part and a secondary blow-out opening provided to the back plate at a position opposite to the main blow-out opening in regard to the crankshaft center for cooling a part of a crankcase part, wherein a cooling air guide cover is equipped which is composed of a cylinder air-guide cover part which guides air blown out from the main blow-out opening to flow to cool the cylinder part and cylinder head, and a top cover part which guides air blown out from the secondary blow-out opening to flow along a side face of the crankcase part to cool there and then flow into midstream of the cooling air flow blown out from the main blow-out opening and cooling the cylinder part and cylinder head.