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← ScienceWhich risk increases when exceeding the scavenging limit in two-stroke engines?
A)Increased unburned fuel emissions✓
B)Reduced volumetric efficiency overall
C)Elevated cylinder head temperature
D)Decreased engine scavenging efficiency
💡 Explanation
Exceeding the scavenging limit causes increased unburned fuel emissions because short-circuiting occurs, where fresh air-fuel mixture exits directly through the exhaust port via scavenging; therefore, excess hydrocarbons are apparent, rather than complete combustion within the power stroke.
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