Yamaha 688-45631-01-00 Clutch Dog

The Yamaha 688-45631-01-00 clutch dog is a critical transmission component located in the lower unit gearcase of 2-stroke outboard engines. It engages the forward and reverse gears via interlocking teeth on the propeller shaft. Manufactured from hardened alloy steel to withstand high shock loads and marine corrosion. Designed as direct replacement for OEM part numbers 688-45631-01-00 and superseded 688-45631-00-00. Compatible with Yamaha 50 through 90 horsepower 2-stroke models produced approximately 1989 through 2001. Precision machined splines and dog teeth ensure smooth shifting and secure torque transfer.