The rattling sound from the servo may be due to poor mechanical precision of the gear set or improper setting of the control dead zone, the control dead zone needs to be adjusted or the gear set needs to be replaced.

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When the wheels are badly worn, it will affect the handling stability and driving efficiency. It is necessary to replace the wheels with new ones in time and choose wear-resistant materials to prolong the service life.

A bad motor may cause the RC car to be underpowered, slow moving, or even unable to start. Sometimes it will also have strange noise or overheat phenomenon, need to check and replace in time.

Arm material affects durability and weight. Metal swing arms are stronger but heavier; plastic swing arms are lighter but more prone to wear and tear.