The MC330CR is overrated by Futaba. My friend thermalled his in a 5-minute touring car race with a 23-turn motor. Not sure what gear ratio he used, but he's a careful guy, so I'm thinking something sensible.
No big deal. Just make sure it cools down enough before you run it again. But if its taking the fun out of the hobby, consider upgrading the ESC to something more capable.
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