Introduction
This manual provides essential information for the installation, maintenance, and general understanding of your Serpent S411 RRS Rear Lower Wishbone (X-Hard). This component is designed for use with Serpent S411 models equipped with the optional Serpent RRS System (SER401618). Proper installation and care will ensure optimal performance and longevity of the part.

Image: Serpent S411 RRS Rear Lower Wishbone (X-Hard) in its retail packaging. The packaging displays the Serpent logo, model number 401625, and product description "Wishbone RR Lw RRS system 411 X-hard (2)". The wishbone itself is visible through the clear plastic packaging.
Setup and Installation
The Serpent S411 RRS Rear Lower Wishbone (X-Hard) is a direct replacement or upgrade part for compatible Serpent S411 models. Ensure your vehicle is equipped with the Serpent RRS System (SER401618) for proper fitment.
- Preparation: Gather necessary tools, which typically include small hex wrenches, pliers, and a parts tray. Ensure your workspace is clean and well-lit.
- Disassembly: Carefully remove the existing rear lower wishbone from your S411 chassis. Note the orientation of all removed parts, including pins, shims, and pivot balls.
- Inspection: Inspect surrounding components such as suspension pins, pivot balls, and C-hubs for wear or damage. Replace any worn parts as needed.
- Installation: Install the new X-Hard wishbone. Ensure all pins and pivot balls are seated correctly and move freely without excessive play or binding.
- Securing: Re-secure all fasteners to the manufacturer's recommended torque specifications. Avoid over-tightening, which can strip threads or damage plastic components.
- Final Check: Verify that the suspension arm moves smoothly through its full range of motion and that all components are securely attached.
Refer to your Serpent S411 vehicle's main instruction manual for detailed chassis-specific assembly diagrams and torque specifications.
Operating Considerations
The X-Hard designation indicates a stiffer material compound for the wishbone. This can affect the vehicle's handling characteristics, typically providing a more direct and responsive feel, especially in high-grip conditions or when seeking increased cornering stability. It is important to test the vehicle's handling after installation and make any necessary adjustments to other suspension settings (e.g., shock oil, spring rates, anti-roll bars) to achieve desired performance.
Maintenance
Regular maintenance of your wishbones is crucial for consistent performance and durability.
- Cleaning: After each use, clean the wishbones to remove dirt, dust, and debris. A soft brush and compressed air are effective. Avoid harsh chemicals that may degrade the plastic.
- Inspection: Periodically inspect the wishbones for signs of wear, cracks, or stress marks, especially around pivot points and mounting holes. Replace any damaged wishbones immediately to prevent further issues.
- Pivot Points: Ensure that the suspension pins and pivot balls move freely within the wishbone. Clean and lubricate (if recommended by Serpent) these areas to prevent binding.
- Fasteners: Check that all screws and nuts securing the wishbones are tight. Loose fasteners can lead to excessive play and premature wear.
Troubleshooting
If you experience issues related to your rear lower wishbones, consider the following:
- Excessive Play: If there is too much movement in the suspension arm, check for worn pivot balls, bent suspension pins, or loose fasteners. Replace or tighten as necessary.
- Binding/Stiffness: If the suspension arm does not move freely, check for dirt or debris in the pivot points, bent pins, or over-tightened screws. Clean, straighten, or loosen as required.
- Breakage: Wishbones can break due to impacts. If a wishbone breaks, it must be replaced. Consider the driving conditions and adjust your driving style or vehicle setup to minimize future impacts.
- Uneven Handling: If the vehicle handles inconsistently, check both rear wishbones for identical installation, freedom of movement, and absence of damage. Ensure both sides are symmetrical.
Specifications
| Feature | Detail |
|---|---|
| Part Name | Rear Lower Wishbone (X-Hard) |
| Brand | Serpent |
| Model Number | SER401625 |
| Compatibility | Serpent S411 models with RRS System (SER401618) |
| Material Hardness | X-Hard (Extra Hard) |
| Item Weight | 18.14 g |
| Item Dimensions | 2.5 x 3.5 x 0.75 inches |
| UPC | 8717135085537 |
Warranty Information
For specific warranty terms and conditions regarding the Serpent S411 RRS Rear Lower Wishbone (X-Hard), please refer to the official Serpent website or contact Serpent customer support directly. Warranty coverage typically applies to manufacturing defects and does not cover damage resulting from normal wear and tear, misuse, or impacts.
Customer Support
If you require further assistance or have questions not covered in this manual, please visit the official Serpent website for support resources, FAQs, and contact information. You may also consult with your local authorized Serpent dealer for expert advice and service.
Official Serpent Website: www.serpent.com





