Yamaha - Dog Clutch Lower Unit Shifting Component 6CE-45631-00-00. Overview. When a Yamaha doesn't shift clean into gear, the dog clutch is usually one of the first things I check. It's what locks the gears in when you go into forward or reverse, so it takes a lot of abuse over time. I've seen worn clutches cause slipping or that harsh grinding sound nobody wants to hear. When it's in good shape, shifting feels solid and immediate, just like it should.. Key Features. • Positive Gear Engagement - Locks gears securely for smooth and reliable shifting.• Precision Cut Engagement Teeth - Designed for clean contact to reduce grinding and wear.• High-Strength Construction - Built to handle repeated shifting under load conditions.• Consistent Shift Performance - Helps maintain smooth transitions between forward, neutral, and reverse.• Factory-Spec Fitment - Engineered to match Yamaha lower unit tolerances for proper operation.. Engine & Boat Compatibility. Designed for Yamaha outboard lower un