Garelli Gran sport Pop sound and sudden loss of power under wot

Joseph Pecaitis /
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I was riding my 1978 Garelli Gran sport today which as been working great for the past 2 months. This moped has a Polini 70cc kit, 14 12 Delloroto carbs with a 65 jet( i know this is shitty im going to upgrade to a 19 or 21mm soon) and Garelli brn custom head, and a temp gauge on the head which doesn't reach over 330 degrees. Today I had a bit of a scare when I was going up a hill which wasn't too steep under wot and I had for just a moment a loss of power and a loud pop that happened once. I got off the throttle and then got back on it and it didn't happen again but I only rode it for another 2 miles until I was back. Any ideas for this? I would rather not have this happen again and destroy the internals

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