Spektrum Firma 3660 4000Kv 4-Pole Brushless Motor 5mm SPMXSM5000

The Spektrum Firma 3660 4000Kv 4-Pole Brushless Motor is a sensorless 2S to 3S LiPo motor for compatible ARRMA and other surface RC vehicles needing a durable 5mm shaft replacement motor.

This Firma brushless motor is suited to compatible 1/10 and 1/8 scale surface RC applications where a 3660-size 4000Kv sensorless motor with 4mm bullet connectors is required. The 4-pole rotor, CNC-machined aluminium housing, high-purity copper windings and alloy steel output shaft make it a practical replacement for worn or damaged brushless motors in suitable high-power RC builds.

Features

• 4000Kv Brushless Power: Suits compatible 2S to 3S LiPo surface RC setups requiring a 4000Kv sensorless motor
• 3660 Motor Size: Common performance motor size for suitable ARRMA 3S BLX-style and other compatible RC vehicles
• 4-Pole Rotor Design: Provides strong torque delivery and smooth brushless motor response
• Sensorless Operation: Designed for use with compatible sensorless brushless ESCs
• 5mm Alloy Steel Shaft: Strong output shaft suits compatible pinions with a 5mm bore
• CNC-Machined Aluminium Housing: Helps with motor durability and heat dissipation
• High-Purity Copper Windings: Insulated copper windings support efficient motor operation
• Preinstalled 4mm Bullet Connectors: Allows easier installation when used with matching ESC connectors
• Replacement Motor Option: Manufacturer listed as a replacement motor for the ARRMA INFRACTION 4X4 3S BLX

Specifications

• Brand: Spektrum
• Model: Firma 3660 4000Kv
• SKU: SPMXSM5000
• Product Type: Brushless RC motor
• Motor Type: Sensorless brushless
• Motor Size: 3660
• RPM Per Volt: 4000Kv
• Number Of Poles: 4
• Voltage Range: 7.4V to 11.1V
• Battery Compatibility: 2S to 3S LiPo, when used with a compatible ESC
• Connector Type: 4mm bullet
• Connector Wire Length: 50 mm
• Outer Diameter: 36 mm
• Product Length: 60 mm
• Product Weight: 300 g
• Shaft Diameter: 5 mm
• Shaft Length: 22 mm
• Manufacturer Listed Application: ARRMA INFRACTION 4X4 3S BLX All-Road RTR
• Other Retailer Listed Applications: ARRMA Vorteks 223S, Quake 223S, Fury 223S and Infraction V3 3S BLX

Includes

• 1 x Spektrum Firma 3660 4000Kv 4-pole sensorless brushless motor with 5mm shaft

FAQ

What ESC does this motor need? The Spektrum SPMXSM5000 requires a compatible sensorless brushless ESC that supports the motor, vehicle gearing and 2S to 3S LiPo power setup being used.

What pinion bore does this motor require? The Spektrum SPMXSM5000 uses a 5mm shaft, so it requires a compatible 5mm bore pinion gear.

Does this motor include connectors? Yes. The Spektrum Firma 3660 4000Kv motor includes preinstalled 4mm bullet connectors.

Will this fit my ARRMA vehicle? OZRC recommends confirming the required motor size, shaft diameter, connector type, mounting pattern and gearing for your exact vehicle before ordering.

Important Notes

• Use only with a compatible sensorless brushless ESC.
• Confirm vehicle fitment, motor mount compatibility, gearing and shaft size before installation.
• Use a compatible 5mm bore pinion gear.
• Monitor motor and ESC temperatures after installation, especially when changing gearing, tyres or battery voltage.
• Incorrect gearing or unsuitable battery voltage can overheat the motor or ESC.
• Motor only. ESC, pinion gear, battery, vehicle, tools and mounting hardware are not included unless shown separately.