The YIKONG YK41011 RC Car Hex Wheel Hub (Part No. 21253) should be replaced if it shows signs of excessive wear or no longer holds the wheel securely. Over time, repeated acceleration, braking, and off-road driving can gradually wear the hex shape, reducing power transfer and causing the wheel to loosen.

Common signs that the Hex Wheel Hub needs replacing include:

• Rounded or worn hex surfaces
• Excessive wheel play
• Wheels slipping under acceleration
• Loose wheel fit despite properly tightened wheel nuts
• Cracks or visible deformation

When replacing the hubs, be sure to install the Short hubs on the front axle and the Long hubs on the rear axle. Using the correct parts helps maintain proper wheel alignment, drivetrain efficiency, and stable handling on your YIKONG YK41011 RC Car.

Yes. Although the YIKONG YK4107Pro RC Car Rear View Mirror (Part No. 21213) does not affect driving performance, replacing a broken or missing mirror helps restore the vehicle’s original appearance and improves its overall scale realism.

Compatible with both the YIKONG YK4107Pro RC Car and YIKONG YK4107 RC Car, this original replacement part is made from durable PA (Polyamide) for excellent toughness and impact resistance. It installs directly in the factory mounting position without modification, making it an ideal choice for restoring your RC crawler after damage or completing a scale build.

For collectors, RC enthusiasts, and anyone who enjoys realistic off-road models, replacing the rear view mirror is a simple way to keep the vehicle looking complete and authentic.

The YIKONG YK4107 RC Car Rear Bumper (Part No. 21208) should be replaced if it becomes cracked, severely bent, or can no longer protect the rear of the vehicle effectively. Although the high-strength nylon construction offers excellent impact resistance, repeated collisions or heavy off-road use can eventually weaken the bumper.

Signs that it’s time to replace the rear bumper include:

• Visible cracks or deformation
• Loose or damaged mounting points
• Poor alignment with the chassis
• Reduced protection after heavy impacts
• Broken or missing sections

Replacing a damaged YIKONG YK4107 RC Car Rear Bumper helps protect the chassis, rear axle, suspension, and body shell from further damage, ensuring your RC car remains ready for demanding off-road driving.

If the YIKONG YK4107 RC Car 60A Brushed ESC (Part No. 21180) is not working properly, the issue may be related to the battery, wiring, receiver, motor, or the ESC itself. Before replacing the ESC, inspect the power supply and electrical connections to identify the cause.

Common reasons include:

• A discharged or faulty battery
• A loose XT60H-M connector
• Incorrect wiring or poor electrical connections
• A damaged brushed motor
• Receiver or transmitter connection issues
• ESC overheating or thermal protection
• Water damage or internal short circuits

Check each item one by one. If the battery, motor, receiver, and wiring all function normally but the ESC still does not respond, replacing the YIKONG YK4107 RC Car 60A Brushed ESC is recommended to restore reliable vehicle operation.

The YIKONG YK4107 RC Car Parts 4.0 E Buckle (21162) can be reused if it remains in good condition and still maintains proper holding force. However, repeated removal, heavy vibration, impacts, or deformation may weaken the clip and cause it to loosen during operation.

Before reusing an E Buckle, check whether it is bent, damaged, or has lost its original spring tension. If the clip no longer fits tightly into the shaft groove, replace it with a new one to help keep the drivetrain, suspension, and steering components of your YIKONG YK4107 RC Car securely assembled.

The YIKONG YK4107 RC Car Parts Pan Head Hex Socket Screws M3×26 (21141) may become loose due to continuous vibration, especially during off-road driving, jumps, or rough terrain. Using incorrect tightening methods, insufficient thread engagement, or installing screws without proper thread locking on metal-to-metal connections can also increase the risk of loosening.

To prevent this issue, make sure the screws are tightened evenly with the correct hex driver. For metal-to-metal connections, apply a small amount of medium-strength (blue) thread locker. Regularly checking the screws after off-road sessions helps keep your YIKONG YK4107 RC Car components securely assembled.

If your YIKONG YK4107 RC Car develops grinding, clicking, or unusual drivetrain noises, the YIKONG YK4107 RC Car Parts Bearing 5×11×4 (21120) may be one of the components that needs inspection. A worn, dry, rusty, or damaged bearing can increase friction and prevent drivetrain parts from rotating smoothly.

Check the bearing for dirt, lack of lubrication, excessive play, or visible damage. If cleaning and lubrication do not solve the problem, replacing the damaged Bearing 5×11×4 is recommended to protect other drivetrain components such as gears, driveshafts, and differentials.

The YIKONG YK4107 RC Car Parts 17G Servo (no.21110) can be installed in three different functional positions: the front differential lock, rear differential lock, and gear shifting system.

Each function requires its own dedicated 17G Servo to ensure accurate movement and reliable operation. During installation, make sure the servo horn, linkage, and travel settings are adjusted correctly to prevent binding or incomplete movement. Proper installation allows your YIKONG YK4107 RC Car to switch gears and control differential locks smoothly during off-road driving.

The YIKONG YK4107 RC Car Parts Tires (21099) are Padded Tires, so both sides of each tire should be bonded to the wheel using RC tire glue. Proper gluing helps prevent the tire from separating from the wheel during high-speed driving, climbing, or demanding off-road conditions.

Before driving your YIKONG YK4107 RC Car, inspect the glued areas regularly for signs of loosening or separation. If the adhesive begins to fail, re-glue the tire promptly to maintain reliable traction, stable handling, and safe operation.