Antony Rountree said there will be 16 juniors from New Zealand going over, six of them in James' 125cc class.
"Sixty-four have entered his class, where he has to make the Top 40 to qualify for the three finals.
"This is all new for us and we are going in there with a open mind and using it more for experience.
"But first thing is to qualify for the finals and then see what happens from there - we hear the Aussie boys are quick, so it will be interesting."
Practice days begin on Saturday, with racing proper getting underway on the Monday.
The Rountree's shipped their bike over in a container with nine other bikes around three weeks ago and have been informed they arrived at the track.
Sponsors include to Harvey Round Isuzu, Protecta Insurance, Bike Torque, Dirt Bike Repairs and JCR Yamaha.