1, Speed up fastly 2, Three different rates for your choice 3, Long service life 4, Big amount supply Features: 1, Speed up fastly 2, Three different rates for your choice 3, Long service life 4, Big amount supply GY6-125/150 Modify clutch springThis is clutch spring is for modify of GY6-125CC & GY6-150CC, it has features of speed up fastly, long service life. We have total three different speed ...