An outboard motor 12 wherein {HEAD ~ the at least one air introduction passage} comprises {TAIL ~ a pair} of air introduction passages provided at opposite lateral sides of the intake silencer and extending downwardly along the second side of each cylinder head 
comprises
An outboard motor 12 wherein { HEAD ~ the at least one air introduction passage } comprises { TAIL ~ a pair } of air introduction passages provided at opposite lateral sides of the intake silencer and extending downwardly along the second side of each cylinder head
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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