HobbyStar 3665 4-Pole Brushless Sensorless Motor, Waterproof

SKU: 375-17-CNF2

Availability: In stock


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HobbyStar 3665 4-pole brushless motor provides increased torque when compared to a shorter can while still providing top-end grunt. Versatile waterproof design allows you to drive in extreme conditions and motor leads come with pre-installed 4.0mm gold-plated bullet plugs for easy, no-soldering connection.



  • 4-pole motor with 12-slot high-torque design
  • High-purity copper windings maximize efficiency
  • High-RPM ABEC5 oversized bearings
  • Precision balanced rotor for smooth operation and maximum RPM
  • Super-thin (0.2mm) stator laminations 

Voltage recommendations in chart are guidelines for the voltage you can safely run.  It is still critical that the user monitor motor temps and adjust gearing if necessary, any motor can overheat to the point of destruction if over-geared even when running at or below the rated voltage. 


Product KV (RPM/Volt) Max Voltage Max Amps Rotor Poles IO Resistance Watts Max RPM Length (mm) Diameter (mm) Weight (g) Shaft Diameter (mm) Shaft Length (mm) Connectors
3665/3Y 2100 6S 60A 4 1.9A 0.0162 1400W 50,000 65 36 245 5.0 16.5 4.0mm gold
3665/2.5Y 2600 5S 75A 4 2.9A 0.0116 1400W 50,000 65 36 245 5.0 16.5 4.0mm gold
3665/2Y 3100 4S 80A 4 3.9A 0.0061 1400W 50,000 65 36 245 5.0 16.5 4.0mm gold


Customer Reviews (1)

2600kv is a beast!Review by Freedom
Im extremely happy with my new 2600kv. Its very smooth an barely cogs. Has tons of torque an plenty of top speed. Very quiet motor. Top quality with a unbeatable price. I highly recommend an i will buy again. Im beginning to think i should of tried one of there esc. (Posted on 3/3/2020)

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Does this have a 5 mm shaft
Yes, this motor does have a 5mm shaft.
RCJuice answered on October 26, 2020
What size is the bullet connector? 4mm?
Yes, the connectors are 4mm.
RCJuice answered on May 19, 2020