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After the generator set has been used for a period of time, everything is normal except that the power decreases. What is the main cause?


a. The air filter is too dirty and the suction air is insufficient. The air filter must be cleaned or replaced now.
 
b. The fuel strainer is too dirty, and fuel injection quantity is not enough. It needs to be replaced or cleaned. 
 
c. Fire ignition time is not right and needs to be adjusted.