Tamiya 54611 - OP.1611 Brushless Motor 02 w/Sensor 10.5T OP-1611  [54611]

That is a Next Generation Tamiya Brushless engine. The motor design incorporates sensor technology, that allows the motor to communicate effectively with all the electronic speed controller (ESC) in your model, allowing efficient performance.

Key benefits:

• Provides smooth operation at both low and high rates.
  
• Brushless design makes for long engine life and paid down maintenance rounds.
  
• Ideally suited to utilize with Item 45066 Tamiya Brushless ESC 03 (Sensored). Also suitable for Item 45047 (TBLE-01S) and Item 45057* (TBLE-02S).
  
• When working with Item 54611 (10.5T) with Item 45057 (TBLE-02S), it is strongly suggested to set up Item 45063 TFU-01 ESC Cooling Fan Unit to ESC, as ESC's overheat security function are triggered because of exorbitant load.
  
• Motor timing is adjustable. 54612 Tamiya Brushless Engine 02 (Sensored) 15.5T