Patent ID: 6848407

Claim:
A decompression device for an engine having a crankshaft, engine valves, a cam gear disposed between said crankshaft and said engine valves, said cam gear being driven by said crankshaft, and a cam formed on a first side of said cam gear, said cam having a cam surface for opening and closing said engine valves, said decompression device comprising: a decompression lever having a first end portion and a second end portion, said first end portion defining a weight section being urged into an initial position toward the center of rotation of said cam gear, said second end portion defining a pivot opening and a lifter section, said lifter section being located in the vicinity of said pivot opening but being spaced apart therefrom, said lifter section protruding toward said first side of said cam gear through a slot formed in said cam gear, and a pivot pin disposed on a second side of said cam gear, said pivot pin being fitted in said pivot opening to rotatably support said decompression lever, whereby said decompression lever is rotatable by a centrifugal force when said cam gear is rotating, said lifter section being configured to protrude from said cam surface at least when said cam gear is stopped, and when said decompression lever is rotated said lifter section is accommodated within a recess formed in said cam gear, such that said lifter section extends beyond said cam surface or is retracted into said recess depending upon the rotational speed of said decompression lever.