EMAX ECOII 4320 Brushless Motor 350KV 380KV 420KV 500KV – Emax USA

EMAX ECOII 4320 Brushless Motor

The EMAX ECOII 4320 is a high-torque, large-format brushless motor built for long-range FPV platforms, heavy-lift multirotors, and cinematic builds running 13"–15" propellers on 6S to 12S battery configurations. Built around a 12N14P stator with a Ø50.6 × 68.7mm profile, 6mm steel shaft, and 30×30mm 4×M4 mounting pattern, the ECOII 4320 delivers smooth, sustained power across four KV options — from 350KV on 12S down to 500KV on 6S.

Key Features

• Stator configuration: 12N14P
• Available KV ratings: 350KV / 380KV / 420KV / 500KV
• Optimized for 13"–15" propellers on 6S–12S builds
• 6mm steel bearing shaft with CW thread
• M6 prop adapter shaft thread
• 30×30mm — 4×M4 mounting pattern
• 400mm 16AWG silicone wire leads
• Precision bearings and anodized finish
• Multi-strand winding for smooth, efficient power delivery

KV / Cell / Propeller Guide

• 350KV — 8S–12S — 13"–15" props (HQ1308, HQ1309, GF1310, HQ1507, HQ1510)
• 380KV — 8S–12S — 13"–15" props (GF1309, HQ1507, GF1308)
• 420KV — 8S — 13"–15" props (HQ1309, HQ1507, 1507)
• 500KV — 6S — 15" props (1507, 1510, HQ1507, GF1507)

Specifications

• Motor Model: ECOII 4320
• Framework: 12N14P
• Dimensions: Ø50.6 × 68.7mm
• Weight (with wire): 298g
• Bearing Shaft: 6mm
• Prop Adapter Shaft Thread: M6
• Shaft Thread: CW
• Lead: 16AWG 400mm
• Mounting: 30×30mm — 4×M4
• KV Options: 350KV / 380KV / 420KV / 500KV
• Peak Current (350KV @ 6S): 82.1A | Max Power: 3847W
• Peak Current (380KV @ 6S): 69.3A | Max Power: 3274W
• Peak Current (420KV @ 6S): 82.5A | Max Power: 2556W
• Peak Current (500KV @ 6S): 74.7A | Max Power: 1797W

Package Includes

• 4× M4×12 screws
• 1× Steel M6 nylock nut