All Yamaha Rhino 660 models had a tendency to be hard to start. This was made worse by cold weather to the point to which some of them wouldn’t start at all. We Live in a climate that changes a lot and we couldn’t get these models to run correctly during winter. We developed this kit to eliminate the hard starting as well as have the choke turned off sooner. The kit includes all the components needed, and instructions as to how to install the kit.