CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
45
Yes
maintenance
Backfire
ITEM
OPERATION
RESULT
NEXT STEP
1
Pull out the spark plug, check whether the spark over is normal.
Yes
Next
No
Check the ignition system
2
Check whether the timing is right
Yes
Next
No
Adjust the timing
3
Check whether there is leakage of the valve
Yes
Adjust the valve
No
Next
4
Check whether the injector is blocked.
Yes
Clean or change the injector
No
Next
5
Check whether the oxygen sensor works well
Yes
Help
No
Change the sensor