Starter spring for the Good Luck chainsaw. The starter return spring rewinds the cord after a pull, keeping the starting mechanism working.
Replace it if it is broken, has lost its elasticity, or the mechanism sticks. Signs: the cord does not return or does not engage the flywheel, the starter slips.
Before buying, check your saw model: for Chinese saws and their analogues, parts of different generations may differ, so rely on the marking and comparison with the old part.
