问题1：这个应该是overheating，对不对？

问题2：网上查，说可能原因很多。行家们认为那些属于常见原因?

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.

问题3：这样的plug会导致lean还是rich？

谢谢

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• 多谢多谢。 -满地找牙- ♂ (0 bytes) (5 reads) 7/10/11

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