Blackstone GBK-700 1L Manual Del Usuario página 69

8.2.4. CLEANING THE CYLINDER FINS
The cylinder fins are responsible for the
cooling of the engine due to its contact
with the air. These fins must be clean and
without any material including those that
limit the flow of air.
A few dirty fins will make the motor to
overheat and can be dangerous. Check the
condition of the cylinder fins regularly.
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