•  A high heat conductive, lightweight aluminum alloy cylinder head has been adopted.

•  Compact, pentroof-type combustion chambers have been adopted, and the spark plugs are mounted at the top of the combustion chamber to improve combustion efficiency.

•  The intake/exhaust port layout is a cross flow type with four valves per cylinder (two intake valves and two exhaust valves) which improves air intake/exhaust efficiency.

•  Torque-to-yield cylinder head bolts have been adopted for the cylinder head bolts.

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