Fault Diagnosis
Compression pressure is low
Valve clearance is not adjusted properly
Valve burns out or is bent
The airtightness of valve seat is not poor
The gasket of cylinder head is leaking
The spark plug is not installed properly
The sound of cylinder head is abnormal
Valve clearance is not adjusted properly
Valve spring is damaged
Compression pressure is too high
Excessive carbon deposition in the combustion chamber
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