Cooper's two victories were enough to give his Tauranga club the bragging rights for winning the senior section of the weekend.
But it was not quite enough to earn the distinction of Battle of the Clubs outright winners, that honour going to the host Taupo Motorcycle Club.
"It was definitely a good day for me," said the 28-year-old Cooper, national MX1 champion last year.
"I feel like I'm on top of my game at the moment but I still want to work more on my starts."
Mangakino's Kayne Lamont (CMR Red Bull KTM 250) was the dominant rider in the MX2 (250cc) class at Taupo.
Lamont won the MX2/veterans' combined race and finished third overall - behind Cooper and Hurley - in the MX1/MX2 race that wrapped up the day.
Meanwhile, Cooper is also impressing with his Australian Motocross Championships campaign, with that 10-round series now at the halfway stage and taking a brief recess, set to resume at Hervey Bay, in Queensland, on July 1.
Cooper is currently ranked sixth in Australia after five rounds, the Suzuki ace having notched up a race win and several top-five finishes in this fiercely-fought competition.
Fellow Kiwi Josh Coppins (Yamaha), of Motueka, leads the title chase in Australia, a solid 21 points ahead of Australian Suzuki ace Todd Waters.