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