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Bad performance of engine under low speed or idling speed
Diagnosis Cause
1、Check ignition timing and valve clearance→Incorrect→ 1、CDI failure
Correct 2、Magneto failure。
3、Sensor failure
4、Too narrow the valve clearance
2、Check joint and leakage of carburetor→Leakage is found 1. Distortion of seal ring of carburetor
No leakage 2. Loose and drop of carburetor joint
3、Fracture of sealing ring
3、Check sparkover of spark plug→Weak spark or sparkover of intermittent→ 1、Spark plug damaged
Normal spark 2、Magneto failure
3、Ignition coil failure
4、CDI Failure
5、Sensor failure
6、Ignition switch failure
7、Spark plug cap failure
8、Wrong connection or short circuit in
power source circuit
Bad performance when engine under high speed
Diagnosis
Cause
1、Check valve clearance and ignition timing→Incorrect→ 1、Magneto failure
Correct 2、CDI failure
3、Sensor failure
4、Incorrect valve clearance
2、Open fuel tube of carburetor→Fuel flow was limited→ 1、Fuel in fuel tank used up
Fuel smoothly flow out 2、Ventilation hole on fuel tank cap blocked
3、Fuel tube from fuel tank to carburetor
blocked
4、Fuel switch blocked
5、Gasoline filtering screen blocked
6、Bad connection negative pressure tube
of fuel tube
3、Check carburetor→Carburetor blocked→ 1、Float needle blocked
Carburetor unblocked 2、Low level of fuel float
3、Main jet of carburetor blocked
4、Float seized up
4、Check gas distribution timing→Incorrect→ 1. Incorrect installation for timing chain and sprocket wheel
Correct 2.Heavy abrasion of gear
5、Check sparkover of spark plug under high speed→Abnormal→ 1、Magneto failure
Normal sparkover 2、CDI failure
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