... life 4, Big amount supply Features: 1, Speed up fastly 2, Three different rates for your choice 3, Long service life 4 ... 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 rate for your choice. GY6 modify parts, GY6-125 modify clutch spring ...