Safety Information
WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property and cause serious injury. This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this Product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. The product manual contains instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
Product Overview
The Onyx 1/10 4-Pole ESC/Brushless Motor Combo (Model ONXS0501) is designed for remote-controlled vehicles, offering a powerful 4000Kv brushless motor paired with a robust Electronic Speed Control (ESC). This combo features 3.5mm bullet connectors for the motor and an EC3 connector for the battery, providing a reliable and efficient power system for various RC applications.

Image: The Onyx 1/10 4-Pole ESC/Brushless Motor Combo, showing the blue 4000Kv motor on the right and the black Electronic Speed Control (ESC) unit with a cooling fan on the left. Both components are connected by wires, and the ESC has a power switch and battery connector.
Setup
Proper setup is crucial for optimal performance and longevity of your ESC/Brushless Motor Combo. Follow these steps carefully:
- Mounting the Motor: Securely mount the 4000Kv brushless motor in your vehicle's motor mount. Ensure proper gear mesh between the motor pinion and the vehicle's spur gear.
- Mounting the ESC: Install the Electronic Speed Control (ESC) in a location that allows for good airflow to the cooling fan and protects it from impacts and moisture. Use double-sided tape or screws as appropriate for your vehicle.
- Motor Connection: Connect the three motor wires from the ESC to the motor's three terminals using the 3.5mm bullet connectors. The order of connection may affect motor rotation direction; if the motor spins in the wrong direction, swap any two of the three motor wires.
- Battery Connection: Connect your compatible battery pack to the ESC's EC3 connector. Ensure the battery voltage is within the ESC's specified operating range (e.g., 2S-3S LiPo).
- Receiver Connection: Plug the ESC's throttle lead into the throttle channel (typically channel 2) of your vehicle's receiver.
- Radio System Setup: Ensure your radio transmitter is properly bound to the receiver and that throttle trim is set to neutral.
- ESC Calibration: Refer to the specific ESC manual (if provided separately or integrated) for throttle range calibration. This typically involves powering on the ESC while holding the throttle at full, then neutral, then full reverse on your transmitter to teach the ESC the radio's throttle endpoints.
Operating Instructions
Once the combo is installed and calibrated, you are ready to operate your vehicle:
- Power On Sequence:
- Turn on your radio transmitter first.
- Connect the battery to the ESC.
- Turn on the ESC using its power switch.
- Initial Check: Verify that the steering operates correctly and that the motor responds to throttle input as expected. If the motor spins in reverse, power off and swap any two motor wires.
- Driving: Gradually apply throttle. Avoid sudden full throttle inputs, especially with high-power batteries, to prevent damage to drivetrain components. Monitor motor and ESC temperatures during operation.
- Power Off Sequence:
- Turn off the ESC.
- Disconnect the battery from the ESC.
- Turn off your radio transmitter.
Note: Always ensure adequate cooling for both the motor and ESC, especially during aggressive driving or in high ambient temperatures. Overheating can lead to reduced performance and component damage.
Maintenance
Regular maintenance will extend the life and performance of your Onyx ESC/Brushless Motor Combo:
- Cleaning: After each use, especially in dusty or dirty conditions, gently clean the motor and ESC. Use a soft brush or compressed air to remove dirt and debris. Avoid using water or solvents directly on electronic components.
- Inspections:
- Check all wire connections (motor, battery, receiver) for looseness or damage.
- Inspect the motor's bullet connectors and the ESC's EC3 connector for signs of wear or corrosion.
- Ensure the ESC's cooling fan is free of obstructions and spins freely.
- Check the motor's shaft and bearings for smooth rotation.
- Storage: When not in use, store the combo in a clean, dry place away from extreme temperatures and direct sunlight. Disconnect the battery from the ESC for storage.
Troubleshooting
If you encounter issues with your Onyx ESC/Brushless Motor Combo, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Motor not spinning / No power |
|
|
| Motor spins in wrong direction | Incorrect motor wire connection order. | Swap any two of the three motor wires between the ESC and motor. |
| ESC or Motor overheating |
|
|
| Erratic operation / Loss of control |
|
|
Specifications
| Feature | Detail |
|---|---|
| Brand | Onyx |
| Model Name | Onyx 1/10 4-Pole ESC/Brushless Motor Combo, 4000Kv: 3.5mm Bullet, EC3, ONXS0501 |
| Model Number | ONXS0501 |
| Motor Kv Rating | 4000Kv |
| Motor Type | 4-Pole Brushless |
| ESC Connector Type (Battery) | EC3 |
| Motor Connector Type (ESC) | 3.5mm Bullet |
| Voltage (Nominal) | 12 Volts (Compatible with 2S-3S LiPo, check ESC manual for exact range) |
| Material | Plastic (housing) |
| Item Weight | 1.6 ounces (approx. 45 grams) |
| Product Dimensions | 6 x 4.4 x 2 inches (approx.) |
| UPC | 605482417812 |
| Manufacturer Recommended Age | 14 years and up |
| Date First Available | December 16, 2019 |
Warranty and Support
For warranty information, technical support, or service inquiries regarding your Onyx 1/10 4-Pole ESC/Brushless Motor Combo, please contact the manufacturer, Horizon Hobby, LLC, directly. Retain your proof of purchase for any warranty claims.
It is recommended to visit the official Horizon Hobby website or contact their customer service for the most up-to-date support resources, FAQs, and contact details.


