Wanganui's James Rountree entered his Kawasaki KX85 in the 13-16 years' 85cc class, with his 22 points leaving him in 14th of the 16 riders.
In the headline events, Taupo's Brad Groombridge (Suzuki) scored a hat-trick of wins to dominate the MX1 class, while Rotorua's Scotty Canham (Kawasaki) won the MX2 250cc class.
Motorcycling NZ motocross commissioner Howard Lilly was pleased with the riders' response to this resurrected North Island competition. "The track conditions were perfect. It was excellent for this time of the year.
"The feedback from the riders was great and they are all looking forward to Round 2 near Hastings. I felt it was important for MNZ to have events spread through the other parts of the year.
"The major national championship events are usually staged around February and March and by having the North Island championship events in August and September, we can spread the competition a little further and a little wider."
The second and final round will be on September 20.