um CBF 125 - Engine Doesn’t Start

CBF 125 AIR COOLING ENGINE SERVICE MANUAL
RENEGADE SPORT & SCRAMBLER X 125 EFI
110
 Whether there is leakage of the fuel pipe or not.
 Whether there is block/leakage or damage of the intake pipe.
 Ageing on the high-voltage cable.
 Whether the ground connection is strong enough.
 All the connectors connected well.
Note: if any item above exists, please do the fix it first before start the analysis.
Diagnostic Help：
 Make sure there is no any engine issue record.
 Have checked and follow the instructions shown above and no cause found.
 Do not ignore the maintenance situation, cylinder pressure, mechanical timing and fuel quality.
 Change the ECU and repeat the test, if the issue is gone, then the root cause is the ECU. Or
change the old one back to check the root cause.
 Engine doesn’t start
STEP
OPERATION
SOLVED
FOLLOWING STEP
1
Check whether the voltage of the battery is around 8-12V.
Yes
Next
No
Change the battery.
2
Crank the engine, and check whether the voltage is above 8V.
Yes
Next
No
Change the battery.
3
Check whether the start motor working well or not.
Yes
Next
No
Change the start
motor.
4
If the issue only occurs in winter, check the oil and gear box
oil.
Yes
Change the oil
No
Next
5
Check whether the engine rotation resistance is too big or
not.
Yes
Check the enigne
No
Help