Used Start stop sw assembly from a 1985 Kawasaki 550. Decent shape, Tested and works as it should. Even though it tests good, I would recommend taking it apart and cleaning before installing on your ski. Will work on JS 440/550, and can be adapted to an X2, or 650SX. Can be used with our tether face plate kit part number = teth-kit No returns on any use parts, please email with questions before ordering. Thank you