Abstract: A damper includes a cylinder, a partition member for partitioning the interior of the cylinder into two liquid chambers, an orifice for generating a damping force by flow of liquid, and a bypass path affording communication between the two liquid chambers. The damper further includes a mass body attached to the partition member that is movable in an axial direction of the cylinder and biased to close the bypass path. The speed of the mass body when opening the bypass path is faster than the speed of the mass body when closing the bypass path.

Abstract: Disclosed is an ignition timing control device of an internal combustion engine provided with an auxiliary combustion chamber. The ignition timing is retarded as compared with a conventional ignition timing when the engine is operating at a high number of revolutions per minute under a light load.

Abstract: In a spark-ignition engine of the type having a main combustion chamber and an auxiliary combustion chamber so as to ignite the lean air-fuel mixture, a passage intercommunicating between the main and auxiliary combustion chambers has a bent portion between the ends thereof, and the spark gap of a spark plug is placed at or in the vicinity of the bent portion in the passage.