Basically it means that the motor doesn't even get warm. It's a Neu 1105 1.5y (6800kv) and it could take more power than this system could dish out.
You're right that the Quark 33 is for 1/18th scale, but it all comes down to the battery. If the battery is only going to push out 30 amps, then you're cool. Here's a chart with the specs on the motor:
http://www.fastelectrics.com/blmotors.asp