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← ScienceWhich consequence results when exhaust valve timing fails?
A)Premature detonation within the cylinder
B)Reduced scavenging efficiency lowers power✓
C)Delayed combustion increases heat loss
D)Increased lubricant aeration forms foam
💡 Explanation
Reduced scavenging efficiency follows from poor valve timing in two-stroke engines because the exhaust gases are not fully expelled; therefore, the engine performance decreases rather than alternative combustion problems since fuel mixture is only partly affected.
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