The Gurias piled on the points in a hot afternoon at the National Football Stadium.
Terry Wapi opened the scoring in the opening minutes, converting his own try for a 6 – 0 lead.
Wesley Batari scored nine minutes later, accelerating through a gap in the Isou 30 metre off the scrum to extend their lead 10 nil.
The Isou received a penalty in the Gurias 30 metre and opted for a penalty kick for a 10 – 2 score line.
In the 30th minute, Eliakim Lukara showed speed and elusiveness to score in the right edge for a 14 - 2 lead at the break.
Four minutes in the second half John Ragi would score after as break from Lucas Kapinias for a 20 – 2 lead.
In the 50th minute, Gurias put together a sneaky set play on the Isou 20 metre line to send over William Aquila to extend their lead 26 – 2.
The Isou showed determination and were rewarded when Josh Ericho scored in the 62nd minute to reduce the score to 20 – 8.
But the Gurias were not done yet with Wapi crossing over for his second try in the 65th minute for 32 - 8 lead.
In the 71st minute, Patrick Takai scored for the visitors for another converted try for a 38- 8 score line.
John Ragi put the final nail in the coffin in the 77th minute for a 42 – 8 scoreline.