3.2 Fault Diagnosis 
Starting motor will not run          Starting motor runs weakly              Starting motor rotates but the engine does not 
•Broken Fuse       •Low battery           •Defective starting clutch 
•Low battery                •Poor connecting wire contact    •Starting motor counter-rotate 
•Defective ignition switch     •Starting motor gear stuck by      •Low battery 
•Defective starting clutch       foreign substances 
•Defective braking switch 
•Defective starting relay 
•Poor connecting wire contact 
•Defective starting motor   
3.3 Starting Motor 
3.3.1 Removal 
* Attention 
Before removing starting motor, the ignition switch must be set at 
“OFF” position. Disconnect battery grounding wire and then turn 
on the power supply to check if starting motor runs to confirm 
your operation is safe. 
 
First remove the lead-wire clip of starting engine.   
Remove starting motor mounting bolt and take down the starting 
motor. 
Roll up the rubber waterproof jacket and remove starting motor connector. 
 
3.3.2 Disassembly 
Disassemble housing screw, front cover, motor housing and other 
parts. 
 
3.3.3 Inspection 
Inspect other component assemblies. 
Replace with a new one when there is surface partial friction, 
injuries or burn. 
The commutator shall be cleaned when there is metal particles 
adhered to its surface. 
Inspect for continuity between contact surfaces of other assemblies. 
Confirm the discontinuity of armature shaft among surfaces of commutator. 
Inspect for continuity of starting motor housing. 
Confirm the continuity between conducting terminal and starting motor housing.