More than a a dozen jet sprint competitors are preparing to test their high performance boats on the Shelter View track at Upokongaro tomorrow.
The private test and tune day is preparation for the opening round of the New Zealand Jet Sprint Championship series on December 27.
Spokeswoman Julia Murray said about 15 crews will test their machines, with several coming from outside the district as there is little other opportunity to check their boats before competition begins.
The course has been filled with water and a working bee was held last weekend to check the tyres on the sides and make sure everything was clear.
"This is now about the boats," said Murray, who admits a few of the locals are working through break down issues at present.
As a competitor, her own team just discovered four cracked pistons in their boat which need some work.
There will also be a big screen at the track during the series which is being tested tomorrow to make sure the timing and links to transponders are all up to scratch.
Shelter View will host the opening and closing rounds of the series on December 27 and the evening of April 13.
Wanganui's jet sprinting world champions Leighton and Kellie Minnell will be looking to defend their national title.