Castle Creations motor and ESC combo recommendations for the RC4WD C2X Class 2 Competition Truck.

For Lighter Rigs (under 6lbs) and strictly low speed crawling:
Mamba Micro X2 w/1406-1900kv on 3s or 4s - Good all around crawler setup. Will need an external BEC or direct to battery servo.
Mamba Micro X2 w/1406-2280kv on 2s or 3s - Great for comp rigs. Will need an external BEC or direct to battery servo.

For Heavier Rigs (under 9lbs), more aggressive crawling, and light duty trail running:
Copperhead 10 w/1406-2280kv on 2s or 3s - Good BEC for single servo. Will need external BEC if running rear steer or winch.
Copperhead 10 w/1406-2850kv on 2s or 3s - A slight step up in wheel speed if you're a bit more aggressive driver.
Mamba X w/1406-2280kv on 2s or 3s - The gold standard of crawler setups. Powerful BEC runs most dual servo steering setups. The Aux wire set for drag brake adjustment is a super handy feature.
The 1406-2850kv paired with with the Mamba X is also a good choice for 2s and 3s if you want a bit more wheel speed.

Always monitor ESC, motor and battery temperatures on new setups or when changing gearing or batteries.