Reduce the starting torque

Damage to starter motor

Increase the starting torque

Starter motor fails to start

Prevent wear on commutator

Provide more contact with commutator

Ensure proper heat dessipation

Provide ventilation to commutator

Abnormally woem brush

Over running clutch slipping

Faullty ECM circuit

Poor contacting action of ignition

Motor running but too fast

Motor not running no operating sound of magentic switch

Starter motor running too slow

Starter motor running but not cranking

Burnt commutator

Battery discharged

Worn brushes

Worn pinion tip