Need help with my G3-build

[JoFreak]

Hey guys!
Finally had a chance to give it the beans on a football ground, veeery nice!
No balooning even when doing wheelies, seems like tapeing the tires worked.
But two questions: The motor went up to nearly 80°C (~175°F) and the ESC stayed at about 60°C (~140°F), the LiPos didn't get noticeable warm.
First question: Whats the max. temperature for an e-motor (Bigmaxximum in my case)?
Second question: Does this mean it's undergeared? If yes, that means I could/should get a bigger or smaller pinion?

Only loss was the antenna end cap that I lost doing a sort of frontflip caused by hard braking. Everything else works perfect, only thing to do is, if you guys say so, changing the pinion and, since yesterday my DX3R arrived, changing the receiver unit.