The aluminum fins solid into the cylinder head of an air-cooled engine act as a radiator, drawing heat away from the combustion chamber and into the encircling air. Sadly, the fins additionally collect dirt, grime and oil over time, resulting in an unattractive mess that can scale back the fins’ capability to cool the engine. Use certainly one of a number of spray-on cleansing merchandise in the marketplace to some extent of success; nonetheless, the degreasing brokers in these cleaners can affect the paint applied to the engine. Instead, clean the cooling fins using family cleaning products.