What must be inspected on the cooling system of an air-cooled engine?

• A. The oil cooler lines for leaks.
• B. The spark plugs for proper gap.
• C. All of the baffles and air seals must be in place and in good condition.
• D. The intake manifold.

Answer: (C)

Air cooling relies on directing ambient air through the cylinder fins to remove heat. The baffles and air seals are what shape that airflow and seal off paths that would bypass the fins. If any baffle is missing or damaged, or an air seal is worn, air can flow around the cylinder instead of through the fins, leading to hot spots and possible overheating. That’s why all of the baffles and air seals must be in place and in good condition—the key factor in effective cooling for an air-cooled engine.

Other items may be part of related engine systems, but they do not directly affect the cooling airflow path: oil cooler lines affect the oil-cooling system, spark plug gaps pertain to ignition, and the intake manifold relates to air-fuel delivery, not cooling.