"I'm pretty happy with my results," said the 28-year-old Townley afterwards.
"I have had quite a bit of time off the bike and it's a long season ahead of me, so I'm not really up to proper race speed yet.
"I still have a lot of testing to do with the new bike but there's no place like a real environment such as this to test things.
"I wish they could hold a national championships round at this venue. It's brilliant."
Meanwhile, fellow Honda star Cameron Dillon, of Taupo, had to be content with finishing runner-up in the MX2 (250cc) class, that battle going right down to the wire with the final corner of the final race deciding in whose hands the trophy would end up.
Dillon won the fourth and final MX2 race of the day but Mount Maunganui's Rhys Carter made a thrilling last-ditch pass on Queenstown-based rival Scotty Columb, just metres from the finish, to claim second spot in that race and also snatch away overall honours for the day.
Dillon (Bel Ray Huka Honda CRF250) finished 1-3-7-1 in his four outings, ending up just on point short of the outright win, taken instead by Carter, who managed 2-2-3-2 in the muck.
"I was having a good day until the rains came," said the 20-year-old Dillon.
"It is encouraging for the upcoming nationals though and makes me hungry to win."