According to TowerHobbies, the RTR Mini Quake is 25 oz., but I don't know if that is with the battery. The Mini Quake SE should be similar but will vary due to the fact that you provide your own motor, esc, electronics, and battery.
I came across this listing on eBay and am somewhat intrigued:
RC Smart 4890 Brushless Motor & 30A ESC
Looks like a longer can than the Mamba, but its shaft diameter is the same as the Mini Quake stock motor (2.3mm vs the Mamba's 2mm). From what I've read, 48 metric pitch pinions are easier to find for 2.3mm shafts.