Yamaha - Clutch, dog - 68T-45631-00-00Yamaha Dog Clutch Lower Unit Shifting Component 68T 45631 00 00 Overview If youve ever felt a hard clunk or hesitation going into gear, the dog clutch is usually where the story starts. This piece is what actually locks the gears in place when you shift, so it takes a beating every time you go from neutral to forward or reverse. When its in good shape, shifts feel clean and predictable. When its worn, youll notice slipping or grinding pretty quick,