I received this information from my friend regarding his experiences shipping his NZ owned bike to Oz in 1999 . His bike was NZ new , meaning the first owner was in NZ . This is important later .
He sent it Airfreight with a freight forwarding company . He is hoping to dig out the name and number in the next day or two .
Import costs = 10 GST ( goods and services tax ) plus stamp duty on registration = 6 %.
His first Oz registration cost 170 AD and 400 AD compulsory third party insurance .
He also said he got messed around by Aussie customs and because of this ended up paying a late collection penalty fee for the bike ( for storage or something I guess ) .
But the biggest pitfall was the fact his bike was not Australian Standards Approved . This meant he had to have the bike inspected by an engineer and then a special plate was sent away for which had to be attached to the frame permanently . This was only done because he qualified for the personal import scheme and had owned the bike more than three months .
So , I guess this puts things in a differnt light . The way I see it you have some alternatives to going through this minefield .
1. Insure the bike for Aus in NZ . Then you won't have to re-register it . I have no idea if there is any carnet needed between the countries . I doubt it as they are in an economic agreement but I can ask my pal if he ever needed one or was asked for one .
2. Sell it in NZ and get one in Oz . My pal says bikes are plentiful and cheap in Oz .
3. Buy a bike in NZ that already has the approval plate attached to the frame .
I hope this doesn't deter you from your trip . NZ is amazing by bike . Make sure you ride the Napier-Taupo road . Only 130 kkms or so but one piece of biker heaven on earth .