First test run in the garden - questions

[CTN]

After getting all the needed parts from the bay i was finally able to have my first test run in the garden.

The car:
XXX-Cr
Super Dialed Setup
+ Sway bar in the back

I'm loving the handling of the car.

The motor:
Nosram 14x2 23T pinion

The question:
The Motor got quite fast quite hot

Is this normal or did I miss something with the slipper/gearing.

I haven't had a car with a slipper before so...

Thanks.