Yamaha All-Terrain-Vehicle Four Wheel Drive Servo/Actuator Motor for 2007-Up Yamaha Models - Replaces Part Number 3B4-4616A-00-00 and 1HP-4616A-00-00 Repair your Four-Wheel-Drive system for a fraction of the cost of the complete servo assembly. Feel the pride of repairing your own equipment with just with basic hand tools. Don't sweat it, we are just a phone call away if you need help or have any questions. Note: This motor will rebuild both the 3B4-4616A-02-00 and 1HP-4616A-00-00 part number servos. They are the exact same. We are proud to offer a "Lifetime Warranty" on our replacement servos.