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Manufacturers > Blue Bird
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BMS-631MG Super Fast Standard Size Servo JR/Hitec
Item: 66 of 90  

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  Weight:     46 grams / 1.62 oz.  
  Size:     40.5 x 20 x 38.5 mm / 1.60 x 0.78 x 1.54 in.  
  Torque At 4.8V:     69 oz-in.  
  Speed At 4.8V:     0.10 sec / 60°  
  Torque At 6.0V:     86 oz-in.  
  Speed At 6.0V:     0.08 sec / 60°  
  Ball Bearing:     Dual  
  Metal Gears:     Yes  
This servo comes with a servo accessory package and is made with a heavy duty servo case. This servo comes with JR/Hitec S Connector also known as a "Universal Connector". Note: Even thought this servo comes with JR/Hitec S Connectors, this servo is electrically compatible with Futaba receivers. Follow the wiring diagram below. If you hook this up incorrectly nothing bad will happen to the servo. Just flip the S connector and around and the servo will work correctly.
  "S" Type Connector    Futaba "J" Connector    Wire Info 

Brown Wire

Black Wire

  Battery Negative 

Red Wire

Red Wire

  Battery Positive 

Orange Wire

White Wire


WARNING: Using the servo arm to turn the servo may cause the gears to break or jump and the servo will stop functioning correctly. This is true for all servos regardless of servo manufacturer. This can also occur as a result of crash damage, hard landing, or improper servo installation. It is important you follow Servo Installation Diagram for proper installation and prevent vibration damage. BP Hobbies assumes no responsibility once this product is installed and used.
Replacement Parts & Accessories:
  • BMS-631MG Metal Gear Set

  • BMS-6xx Series Outside Case

  • BMS-620MG BMS-621MG BMS-630MG BMS-631MG Horn Set

  • Heavy Duty Servo Arms (black)

  • Manufacturer's Specifications
    Caution: People have had trouble stripping the gears and/or burning out their Blue Bird servos with the Traxxas Revo. From customer feedback the problem is that the stock radio that comes with the Revo allows the servo to progress further than it should (the steering's range of travel is not enough for the servo). The servo still has a way to go but the steering has hit the end of its range of motion. This may lead to stripped servo gears/burn out. The problem is not a fault of the servo, it's just not compatible with the Revo's stock radio system. We have tried to contact Traxxas with this issue and they have not responded. The problem does not occur if other brands of receivers are used (JR, Futaba, Hitec, etc). Usin
    Price: $19.50
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    Prices, product specifications, and product availability are subject to change without notice.
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