What are the reasons for the weak starting of the starter motor?

[DelHaley]

The reasons for the weak starting of the starter motor are: 1. Insufficient battery charge or loose connections, dirty terminals, poor contact; 2. Starter motor bushings too tight or too loose; 3. Bent or deformed armature shaft scraping against the magnetic poles; 4. Dirty commutator or brushes, worn brushes, weakened spring tension; 5. Open circuit or partial open circuit in the field coils or armature coils; 6. Burnt contacts in the starter switch. Precautions for using the car motor are: 1. Regularly clean accumulated dirt and dust on the generator surface to maintain cleanliness and good ventilation; 2. Periodically check the tightness of all fasteners related to the generator and promptly tighten all screws; 3. If the generator fails to generate electricity, troubleshoot the issue immediately.