Patent ID: 7721698

Claim:
The ignition system for small engines is comprised of: an inside of a starter case, a cylindrical cam having a cam nail which engages with a pulley centrifugal latchet fixed on an engine crank shaft, and a drive gear connecting to the cylindrical cam via a horse power spring located on the same axis; a stopper being arranged near a cam plate which is integrally formed with the pulley, and engaging with an end part behind the rotation direction of a cam plate depressed area; an urging element that supports the stopper in a movable manner to an engaging position to engage with the depressed area and to an avoidance position for avoiding a cam plate rim, and normally urging the stopper to the avoidance position, on the other hand enabling the stopper to move to the engaging position from outside, and urging the stopper not to move to the avoidance position until a sufficient rotation load is added to the cam plate at the engaging position; a first spring supporting the stopper in a swinging manner to a spindle provided in the starter case, and, around the spindle on both sides of the stopper, urging the stopper to swing to the avoidance position; a second spring urging the stopper to swing to the engaging position to enable the stopper to move to the engaging position by pulling the second spring from the outside.