Hobbywing's Quicrun 3650 Sensored Brushless Motors are a great low cost option. Featuring a heat resistant magnet attached steel case, double insulated windings, precision bearings, fixed endbell and a heavy duty balanced rotor, the Quicrun 3650 delivers outstanding performance and durability that makes them an excellent motor!
 
Features:
Built-in Hall sensor brings drivers the amazing sense of control.
Top-quality components: heat-resistant magnet, heat-resistant wires and name-brand bearings.
Dustproof design at the location where motor leads exit.
Creative design, the gold-plated lockable connector, which can be fastened by screws, utterly eliminated all the potentialities that connectors may loose.
Detachable structure, easy for clean and maintenance, greatly prolongs the service life of the motor.
Specs:
 Motor KV (RPM/V): 13.5T (2500kv)
Weight: 160.0g
Dimension: 35.8x52.2mm
Shaft size: 3.17x15mm