This brings PNG's medals total to three, all of them in weightlifting events.
Last week, Morea Baru won the PNG's first medal in the men's 62kg weightlifting event, followed by Dika Toua, who also won silver in the women's 53kg weightlifting contest.
Defending the men's 94kg weightlifting title Kari won in Glasgow, the Papua New Guinean trailed Canada's Boady Santavy by 14kg after the snatch, Radio New Zealand International reported.
But he responded in stunning fashion to lift 216kg in the clean and jerk, shattering the Commonwealth record by 6kg and the Games record by 11 in a dramatic finish at Carrara Sports Arena.
The monster lift gave him a total of 370kg, pipping his Canadian rival by 1kg, and Kari insists he always backed himself to deliver.
"I believe anything that my coach gives me to win gold, that's what my belief is. It doesn't matter that (I have to lift) 216-217kg but I want to win gold, to lift to win the gold."
This follows on the successes of fellow weightlifters Morea Baru who won silver in the men's 62kg weightlifting event and Dika Toua in the women's 53kg weightlifting contest.
Kari's triumph also secured a 100th Commonwealth Games medal for his coach, Paul Coffa from the Oceania Weightlifting Institute, with whom he shared an emotional embrace after clinching gold.