Features

• Excellent upgrade for 540- and 550-size brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 1/8″ bore)
• High-quality 4-pole sintered rotor

• 4mm gold plated bullet connectors
• High-quality construction with precision ball bearings and hardened steel 1/8″ shaft

Overview

The Firma 4000Kv brushless motor is a great choice for 1/10 scale 4WD, 2WD, and on-road models running on 2S LiPo power. Featuring a low cog 4-pole 8-magnet rotor design, CNC machined aluminum housing, insulated high purity copper windings, high-quality alloy steel 3.175mm (1/8″) output shaft, and precision bearings for high durability and smooth rotation. Preinstalled 4mm gold plated bullet connectors for easy installation, and perfectly matched for the Firma 85A Smart ESC.

Spektrum Firma 4000Kv Brushless Motor Specfications:

• Input Voltage: 6 – 8.4V
• RPM/Volt (Kv): 4000Kv
• Motor Design: Inrunner
• Maximum Continuous Current: 40A
• Motor Type: Brushless – Sensorless
• Application: 1/10 scale 4WD, 2WD, and on-road models running on 2S LiPo power
• Number of Poles: 4
• Product Weight: 7.4oz (210g)
• Shaft Diameter: 0.125″ (3 mm)
• Bushing Or Bearing: Bearing
• Connector Type: 4mm Bullet
• Efficiency: 81%
• Motor Size: 3652

In The Box

• Firma 4000Kv Brushless Motor

Needed to Complete

• 85A ESC

Spec

• Brand: Spektrum
• Part No: SPMXSM1400
• Barcode: 605482715697
• Fitment: Option Part