The YIKONG YK4107 RC Car 4.0 E Buckle (Part No. 21162) is an E-clip designed to secure shafts, pins, and drivetrain components in place. It prevents axial movement and keeps components from slipping off during operation, making it an essential fastening part for maintaining the reliability of the drivetrain and suspension system on the YIKONG YK4107 RC Car.

Why Does the YIKONG YK4107 RC Car Need a 4.0 E Buckle?
Although the 4.0 E Buckle is a small component, it plays a vital role in securing parts and preventing them from coming loose, helping ensure the long-term reliability of your YIKONG YK4107 RC Car.
The 4.0 E Buckle provides several important functions:
- Secures shafts and pins
- Prevents axial movement of components
- Keeps drivetrain parts from slipping off
- Improves overall vehicle reliability
- Ensures smooth drivetrain operation
For off-road driving and rock crawling, a properly installed YIKONG YK4107 RC Car 4.0 E Buckle helps prevent components from loosening due to constant vibration and impacts.

Where Is the 4.0 E Buckle Used?
The 4.0 E Buckle is commonly installed wherever shafts or pins need to be retained, preventing them from moving out of position during operation.
Depending on the vehicle configuration, it may be used in:
- Driveshaft assemblies
- Axle assemblies
- Steering mechanisms
- Suspension linkage systems
- Other shaft-mounted components
Refer to the YIKONG YK4107 RC Car exploded parts diagram or service manual for the exact installation locations.
What Happens If the 4.0 E Buckle Is Missing or Damaged?
Without the 4.0 E Buckle, shafts and pins may no longer be securely retained, potentially causing components to loosen or fall off while driving.
Possible issues include:
- Pins sliding out of position
- Loose drivetrain components
- Suspension linkage failure
- Steering mechanism problems
- Parts falling off during operation
If an E-clip becomes bent, loose, or is lost, it should be replaced immediately.
Daily Maintenance Tips
Regularly inspecting the 4.0 E Buckle helps improve the reliability of your YIKONG YK4107 RC Car and prevents failures caused by small but essential fastening components.
Recommended maintenance:
- Inspect the E-clips after every off-road run.
- Check for bending, wear, or looseness.
- Avoid repeatedly removing and reinstalling the same clip.
- Use the proper tool when removing the clip to prevent deformation.
- Replace any lost or damaged E-clips promptly.
Proper maintenance helps keep your YIKONG YK4107 RC Car operating safely and reliably.
FAQ
Q1: Which models is the 4.0 E Buckle compatible with?
This part is compatible with the YIKONG YK4107 RC Car.
Q2: Is the 4.0 E Buckle considered a wear item?
Yes. Although it is durable, repeated removal, heavy vibration, impacts, or accidental loss can reduce its holding force over time. Regular inspection is recommended.
Q3: Can the E Buckle be reused?
Yes, provided it has not become bent, worn, or lost its spring tension. If it no longer fits securely, replace it with a new one.
Q4: What should I pay attention to during installation?
Make sure the E Buckle is fully seated in the shaft groove and securely locked in place. An improperly installed clip may come off while the vehicle is running.

Product Specifications
| Item | Specification |
|---|---|
| Product Name | 4.0 E Buckle |
| Part Number | 21162 |
| Compatible Model | YIKONG YK4107 RC Car |
| Part Type | RC Car Parts |
| Package Quantity | 6pcs / Set |
Conclusion
The YIKONG YK4107 RC Car 4.0 E Buckle (Part No. 21162) may be a small component, but it plays a critical role in securing shafts, pins, and drivetrain components. By preventing parts from moving or falling off, it helps ensure the reliable operation of the drivetrain, suspension, and steering systems. Regular inspection and timely replacement of worn or missing E Buckles will improve the durability, safety, and off-road performance of your YIKONG YK4107 RC Car.
