um CHILL 125 cc. Service Manual page 44

 Acceleration gets worse
ITEM OPERATION
1 Check whether the air filter is blocked and whether the intake pipe leaks.
2 Check whether the fuel pressure is about 250kPa.
3 Pull out the spark plug, check whether it is wet or not
4 Check whether the TMAP, TPS and the connections works well.
5 Check whether the injector is blocked.
6 Check the type and the clearance of the spark plug.
7 Check whether the cylinder pressure is normal
8 Check whether the exhaust pipe is blocked or not
CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
RESULT
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
No
NEXT STEP
Intake system maintenance
Next
Next
Check the pump
Dry the plug and combustion chamber.
Next
Next
Change the sensor or harness maintenance
Clean or change the injector
Next
Next
Change the spark plug
Next
Check the engine
help
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