Yamaha - Clutch,dog - 688-45631-01-00Yamaha Dog Clutch Gearcase Shifting Component 688 45631 01 00 Overview If your motor starts slipping out of gear or clunking harder than normal, the dog clutch is usually where I start looking. This piece is what actually locks your gears in when you shift into forward or reverse. Over time, those engagement edges wear down, especially if its been shifted hard. A fresh Yamaha dog clutch brings back clean, solid engagement so youre not second guessing