Which risk increases when the air-fuel mixture in a gasoline engine cylinder is excessively lean during combustion?

💡 Explanation

When the air-fuel mix is too lean, combustion temperatures rise significantly because of excess oxygen; this increases heat transfer to the piston crown which may exceed its material limits, leading to melting or cracking. Therefore, piston crown overheating occurs, rather than bearing wear, valve float, or injector fouling, which are caused by different combustion anomalies.

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