HANDHELD TYPE FOUR-CYCLE ENGINE

摘要

With regard to a handheld type four-cycle engine including, in a side wa ll of a cylinder block, an intake valve, an exhaust valve and a valve operation mechanism operable in association with a crankshaft so as to open and close the above-mentioned valves and, an oil tank is formed in one side wall of th e cylinder block, and the oil tank houses the valve operation mechanism and oi l mist generation means for generating an oil mist from stored oil. It is thus possible to reliably lubricate the valve operation mechanism regardless of t he operational position of the engine while allowing the size and weight of the engine main body to be reduced.