What are the symptoms of a broken motorcycle nozzle?

The exhaust pipe emits black smoke, the cylinder works unevenly, and the engine produces obvious vibration.

1. Black smoke from the exhaust pipe: When the motorcycle fuel nozzle fails, the fuel cannot be fully burned, resulting in a lot of black smoke in the exhaust gas.

2. Uneven work of each cylinder leads to obvious engine vibration: The failure of injector will lead to uneven fuel injection of each cylinder, which will lead to unstable engine working state and obvious vibration.