The cylinder head has the following function:

• A. The blown air charge helps clear the cylinder of exhaust gases
• B. It seals the air filter
• C. It houses the start motor
• D. It cools the crankcase

Answer: (A)

The cylinder head serves as the top boundary of the combustion chamber and provides the paths for the incoming air-fuel charge and the spent exhaust gases through its valves and ports. In operation, the incoming blown air charge helps push the burned exhaust out of the cylinder during the scavenging portion of the cycle, helping to clear the cylinder for the next charge. That interaction—air entering and expelling exhaust through the head’s ports and valves—best fits the idea described in this option. The other statements describe functions handled by other systems or components: sealing the air filter is the job of the air cleaner assembly, the start motor (starter) is mounted elsewhere on the engine, and cooling the crankcase is accomplished by the engine’s cooling system, not the cylinder head.