A ratchet gear is continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools.
Then when it was running, the motor was spinning that part with the worm gear ate the teeth off that half-circle gear on the kickstart spindle.
DOUBLE HELICAL GEAR
A special type of gear which is a side to side (not face to face) combination of two helical gears of opposite hands.