請教專家，看圖

 

問題1：這個應該是overheating，對不對？

問題2：網上查，說可能原因很多。行家們認為那些屬於常見原因?

A white colored plug is caused by engine overheating. Failure to repair this engine will result in severe engine damage. Common causes for this are:

Incorrect spark plug (too hot heat range).

Low octane fuel.

Timing is not set properly. 

 

Cooling problems, (dirty cylinder fins, no or low water if water cooled, low or no engine oil). 

Carburetor air/fuel mixture is too lean (too much air). 

Leaking crankshaft seals, no oil, base or head gasket leaks, or crankcase leaks on two stroke engines.

問題3：這樣的plug會導致lean還是rich？

 

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