Internal combustion engine provided with decompressing mechanisms

摘要

An internal combustion engine is provided with a decompressing mechanism (D) including: a pin (71) supported so as to be turnable on a camshaft (15); a flyweight(81) supported for turning relative to the camshaft (15) by the pin (71) on the camshaft (15); and a decompression cam (82) capable of operating together with the flyweight (81) to apply valve opening force to the engine valve(43). The pin (71) is inserted in holes (84) formed in the flyweight (81) so as to be turnable. A spring washer (72) restrains the pin (71)and the flyweight (81) from movement relative to each other, so that generation of rattling noise due to collision between the pin (71) and the flyweight (81) can be prevented or controlled.