{HEAD ~ An outboard motor} 12 wherein {TAIL ~ the at least one air introduction passage} comprises 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 
wherein
{ HEAD ~ An outboard motor } 12 wherein { TAIL ~ the at least one air introduction passage } comprises 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
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL 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