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1. A lubrication apparatus of a four-stroke portable engine, comprising:
a piston; a cylinder; a crank chamber; and a valve operating chamber, the lubrication apparatus configured to lubricate driving parts while circulating oil mist through an oil circulation pathway, using pressure fluctuation in the crank chamber, the pressure fluctuation being caused by reciprocating motion of the piston, the lubrication apparatus further comprising a direct passageway configured to allow communication between the valve operating chamber and the crank chamber when a negative pressure is created in the crank chamber, wherein the direct passageway supplies the oil mist in the valve operating chamber to the crank chamber, and wherein the direct passageway includes a flexible tube part that is formed outside of an outer surface of the portable engine.
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