EMAX ECO II 2207

What you get

• About 2 kg of pull on 6S

  On EMAX’s 25.2 V bench the 1900KV pulled 2,020 g at full throttle on a DALPROP Cyclone 5046, drawing 40.6 A.

  Source: EMAX 1900KV thrust tables

• N52SH arc magnets

  Curved N52SH magnets. EMAX says the step up from N48 magnets gives more torque and thrust and higher rpm.

  Source: EMAX USA product page

• Rounded, polished bell

  EMAX redesigned the bell with a rounder shape and thicker reinforcements for durability, and finished it with a mirror polish.

  Source: EMAX USA product page

• EZO bearings

  EZO 9 mm bearings carry a steel shaft with an M5 thread.

  Source: EMAX USA product page, EMAX product page, EMAX spec sheet

What to pair it with

Our reading of EMAX’s numbers, so your build matches what the motor was tested with.

ESC

EMAX rates the peak current at 45 A for the 1900KV and 38 A for the 1700KV on 6S, and 43 A for the 2400KV on 4S. Its own bench tests topped out at 43.8 A (1900KV, Cyclone 5050). A 45 A or bigger ESC covers all three. (EMAX spec sheet, EMAX 1900KV thrust tables)

Props

EMAX lists 5 to 5.5-inch props. On its 6S bench the 1900KV pulled 1,860–2,020 g at full throttle on six props, most on the DALPROP Cyclone 5046; the 1700KV pulled most on the HQ 5.5 × 4 × 3 (1,980 g). (EMAX spec sheet, EMAX 1700KV thrust tables, EMAX 1900KV thrust tables)

Battery

6S for the 1700KV and 1900KV, 4S for the 2400KV. EMAX rates the first two for 3S–6S and the 2400KV for 3S–4S. (EMAX spec sheet)

Frame

Four M3 holes on a 16 mm circle (16 × 16 mm, which EMAX says fits the most common 5-inch frames). M3 screws in 6, 7 and 8 mm lengths and an M5 nylock nut come in the box. (EMAX spec sheet, EMAX USA product page, EMAX product page)

Where to buy

• EMAX USAthe maker’s store; same price for every KV (the 2400KV was listed as sold out)
  $12.99seen Oct 19, 2026
  Visit
• RaceDayQuads1900KV
  price on the store’s page
  Visit
• Pyrodrone1900KV
  price on the store’s page
  Visit
• WREKDchoose the KV
  price on the store’s page
  Visit
• NewBeeDrone1900KV
  price on the store’s page
  Visit

Plain links, not affiliate links. Prices change; the store’s page has the current one.

Full specs

Bench data

Redrawn from EMAX’s test reports. Thrust is static pull on a bench, more than you get in flight. Power is volts × amps; efficiency is thrust divided by power.

Inside the motor

A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:

• Shaft. Steel, M5 thread, protrudes 13 mm; 4 mm through the bearings. (EMAX spec sheet, EMAX product page)
• Bell. Rounded, with thicker reinforcements; mirror-polished. (EMAX USA product page)
• Magnets. N52SH arc magnets (EMAX’s infographic says N52, replacing the N48 magnets of its predecessor). (EMAX USA product page)
• Stator. The coils are wound on a stack of thin steel laminations: 22 × 7 mm (2207). (EMAX USA product page)
• Winding. Multi-strand. (EMAX product page)
• Bearings. EZO 9 mm. (EMAX USA product page)
• Base. 4 × M3 holes on a 16 mm circle (16 × 16 mm). (EMAX spec sheet)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1900KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.

A 14-pole rotor has 7 pole pairs, so every turn of the shaft is 7 electrical cycles, and a six-step ESC switches the phases 42 times per turn.

About the 3D model

A generic outrunner drawn from EMAX’s published sizes: the 22 × 7 mm stator, 27.5 mm bell, 20.2 mm height, 5 mm shaft, 16 mm mounting circle and 12 teeth and 14 magnets. Anything EMAX doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.

Sources

1. EMAX USA: ECO II 2207 Brushless Motor (product page, with EMAX’s ECO II infographics). Retrieved Oct 19, 2026.
2. EMAX: ECO II Series 2207 1700KV 1900KV 2400KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
3. EMAX: ECO II 2207 spec sheet (dimension drawing and spec table for each KV; image on EMAX’s product page). Retrieved Oct 19, 2026.
4. EMAX: ECO II 2207 1700KV thrust tables at 25.2 V, seven props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then "Max" at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.
5. EMAX: ECO II 2207 1900KV thrust tables at 25.2 V, six props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then "Max" at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.
6. EMAX: ECO II 2207 2400KV thrust tables at 16.8 V, seven props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then "Max" at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.