An intake air duct serves as a passage for supplying air to an engine, and includes a first intake air passage, a second intake air passage, {TAIL ~ an opening and closing valve}, an interlocking member and {HEAD ~ a coiled spring} 
An intake air duct serves as a passage for supplying air to an engine , and includes a first intake air passage , a second intake air passage , { TAIL ~ an opening and closing valve } , an interlocking member and { HEAD ~ a coiled spring }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD