Motor Makes Grinding or Clicking Noise

Your motor makes a grinding, clicking, or rattling noise — especially under load or climbing hills. This typically indicates internal motor bearing wear or a damaged connector.

Step 1: Spin Test

Lift the rear wheel off the ground (use a bike stand or flip the bike). Spin the rear wheel by hand slowly. Listen carefully:

• Smooth spinning with minimal resistance = motor internals are fine, check connectors
• Grinding, crunching, or rough spots = motor bearings or gears are worn
• Clicking at regular intervals = debris inside the motor or a broken gear tooth

Step 2: Inspect Motor Wire Connector

Check the motor wire connector at the rear dropout. Look for:

• Melted or deformed plastic housing
• Blackened or burned pins
• Corroded or green-tinted contacts

Damaged connectors can cause the motor to run erratically, producing unusual sounds.

Step 3: Try the Extension Cable First

If the connector shows heat damage, replace the motor extension cable first. This is significantly cheaper than a full motor replacement and resolves the issue in many cases.

Step 4: Motor Replacement

If the spin test confirms internal grinding and the connector looks fine, the motor assembly needs replacement. Contact support with your serial number — we'll ship the correct motor for your specific model.

⚠️ Warning: If you see melted or burned wires at the motor connector, also inspect the controller for secondary damage. A short in the motor wire can damage the controller too.

Bikes most affected: Shred, Boar Hunter, Boar Explorer, Quad