i am a customs broker who works for a freight forwarder in Australia & handle motorbike shipments into Brisbane/Sydney/Melbourne
I havent cleared one into Perth before but can organise this for you but i need to know more about the shipment
Is the bike being returned to Australia or is it a first time import or do you have a carnet for example?
If it is a first time import, you will need an import permit from Dept of Road Transport which i can organise for you if need be
Please email me on email@example.com
and provide further information