How to Install Rear Upper Suspension Arms on HP141/HP141S

By BEZGAR | Published: 2026-10-28

Category: How-to Guides

Step-by-step guide to replacing rear upper suspension arms on HP141 and HP141S RC cars, including fit checks, installation tips, and common mistakes to avoid.

Quick answer

To install rear upper suspension arms on HP141/HP141S, remove the wheel and lower arm, swap in the new arm, and reattach with proper alignment—no special tools required.

Why replacement matters

The rear upper arms control the camber and keep the rear wheels tracking straight. Worn or bent arms cause uneven tire wear and sloppy handling, especially after a hard impact.

Using the correct original spare part ensures the arm matches the factory geometry and mounting points. The BEZGAR Rear Upper Suspension Arms (14240B) are designed specifically for HP141 and HP141S models, so you avoid fitment guesswork.

Installation steps

Prepare the car: Place the RC car on a flat, stable surface and remove the rear wheel on the side you are working on. Use a 2mm hex driver to loosen the wheel nut, then pull the wheel off the hex hub. Check that the wheel nut is fully removed before pulling, or you may strip the threads.
Disconnect the lower arm: Using a 2mm hex driver, remove the screw that secures the lower suspension arm to the chassis. This gives you access to the upper arm mounting point. Keep the screw and any washers in a safe place. Note the orientation of the washers—reinstalling them reversed can cause binding.
Remove the old upper arm: Locate the upper arm between the chassis and the upright. Remove the screw on the chassis side and the screw on the upright side, then pull the arm out. If it is stuck, gently wiggle it free—do not force it. Check the old arm for cracks or bends; if the new arm feels loose, inspect the mounting holes for wear.
Install the new upper arm: Position the new BEZGAR rear upper arm (14240B) so the ball ends align with the chassis and upright holes. Insert the screws and tighten them just snug—do not fully tighten yet. Make sure the arm moves freely after installation; if it binds, loosen the screws and realign.
Reattach the lower arm and wheel: Reinstall the lower arm screw and tighten it fully. Then reattach the wheel and tighten the wheel nut. Finally, go back and fully tighten the upper arm screws. Tighten the upper arm screws after the lower arm is in place to avoid preloading the suspension.
Test the suspension: Press down on the rear of the car and release. The suspension should compress and rebound smoothly without binding or clicking. If it feels rough, check the screw tightness and arm alignment. A smooth cycle confirms correct installation; any binding means something is misaligned.

Product facts

Rear Upper Suspension Arms(14240B) for HP141/HP141S: This BEZGAR Rear Upper Suspension Arms (14240B) is a genuine replacement part, designed for a precise fit and reliable performance. You get a drop-in fit without modifying the mounting points, saving time and reducing the risk of installation errors.
Rear Upper Suspension Arms(14240B) for HP141/HP141S