FMS Predator 4250 Kv540 Motor

Brand: FMS

Part No: PRKV540

£39.89 ~~RRP £41.99~~

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The FMS Predator 4250 Kv540 Motor (part number PRKV540) offers a 540Kv rating with an 800W power specification and operation up to 18V. Weighing approximately 230g, it is specified with a 40–60A ESC and a 42mm diameter, providing a practical fit for models using the FMS Predator series motors.

Built with N45H magnets, this unit includes clear installation dimensions such as a 36.2mm front shaft length and a 97.3mm total length, helping streamline setup and maintenance.

Key Specifications

Kv (rpm/V): 540
Voltage (S): 4; Max voltage: 18V
Power: up to 800W
Max current: 52A
ESC: 40–60A
Weight (excluding connectors): 230g
Magnet type: N45H
Diameter (C): 42mm
Total length (E): 97.3mm
Front shaft length: 36.2mm
Length B: 54.3mm
Can length (D): 27mm
Lamination thickness: 21.7mm
Shaft A: M8
Resistance (mh): 0.031

Suggested Compatibility

FMS 1400mm P-51D V8
FMS P-51B
FMS F4U V3

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FMS PREDATOR 4250 KV540 MOTOR

Specifications

Manufacturer: FMS
Dimension (mm): ?42*97.2
Weight (not including connectors): 230g
Voltage (S): 4
Max Current (A): 2
Length of Front Shaft (mm): 36.2
ESC: 40-60A
Lamination Thickness (mm): 21.7mm
Magnet Type: N45H
Kv (rpm/v): 540
Max Current (A): 52
Resistance (mh): 0.031
Max Voltage (V): 18V
Power (W): 800W
Shaft A (mm): M8
Length B (mm): 54.3
Diameter C (mm): 42
Can Length D (mm): 27
Total Length E (mm): 97.3
Items: 1400mm P-51D V8/ P-51B/ F4U V3

Key Info:

Brand: FMS
Part No: PRKV540
Barcode: 5056135718476

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Questions & Answers

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propeller for a 2m vingspen?

Bjørn Egil Kalrud / 26th September 2025

This would be a good one to start from APCLP15070

Steve @ Wheelspin Models

Hi, Woulkd I be able to run a predator 4250-KV540 motor (with a 70A with 5A BEC) on a 5s lipo battery. All fitted stock in an FMS P51B MUSTANG. Look forward to hearing back from you, Kind regards, Alex.

Alex Lay / 12th December 2023

Sorry this motor is 4s max.

Steve @ Wheelspin Models

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