FOUR-CYCLE ENGINE IN POWER CHAIN SAW

摘要

PROBLEM TO BE SOLVED: To form a valve driving device for an internal combustion engine controlled by a valve so as to guide a grip pipe crossing a casing to the vicinity of the center of gravity of an appliance when using the portable work appliance. SOLUTION: A rocker arm 10 extends in almost parallel to a part 39 of the adjacent grip pipe 30 by using the vertical axis 44.