Generic Trigger SM 50ccm - Improper Gyration (Especially at Low Speed)

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Improper gyration（especially at low speed）
Troubleshooting Tune-up inspection Failure cause
Normal Abnormal
Ignition time
adjustment
Favorable
adjustment
Maladjusted
Adjust the
adjustable screw of
carburetor oil level
No intake air With intake air
Dismantle the spark plug
and put it into spark plug
cover to connect engine
and check whether the
spark plug has flashover
Favorable
spark plug
flashover
Bad spark plug
flashover
Bad
Favorable
Intake air in
carburetor shim
CDI group is broken
Trigger is broken
Rare gas mixture（loosen the bolt）
Too thick gas mixture （locking
screw）
Bad heat spacer shim
Loosen fixing nut of carburetor
Broken shock insulator
Broken suction line
Bad or polluted spark plug
Bad CDI
Bad sparking coil
The lead of spark plug is open circuit
or short circuit
Main switch is broken
Damaged suction line
Ventilation hole clogged