Former winner Sam Osborne also gave his main rivals an early advantage in the men's race but stormed home to win in 54m 04s, ahead of 16-year-old Kyle Smith from Taupo (54m 57s) and Tauranga's Andrew Lloyd (55m12s).
Rotorua-based Osborne says he felt in charge as soon as began the run.
"I found my legs and just hit it. I was a good 15 seconds behind but there was a bit of game playing going on," he said. "I know I am in really good run shape so was not too keen to do a lot of work on the bike, which they knew.
"I came off a hard race last week at the Oceania Cup in Mooloolaba over the Olympic distance so it is always hard to back up two weekends in a row. I am stoked with it today."
Lloyd and fellow local triathlete Aidan Dunstan, who finished fifth, leave for Germany shortly for a northern summer competing at regional and international triathlons.
Lloyd found the Marra Triathlon difficult after a three week lay off following the Oceania champs in Australia.
"It was hard off no training but I am happy considering," he said. "It became quite tactical on the bike as we knew Sam was the favoured runner. The Mount is a wicked training ground and you can train on any day of the week and it is easy to run around. "But you put it at the end of a race and it is so much harder and it is never easy running around the Mount on the back of a hard bike. The podium is all right!"