Yamaha 688-45551-00 Lower Unit Gear Set

Technical specifications for the Yamaha 688 series lower unit gear set. The set comprises a 13-tooth pinion gear (688-45551-00), a 26-tooth forward gear (688-45560-00), and a 26-tooth reverse gear (688-45571-00). Manufactured from alloy steel (20CrMo) for high wear resistance and load capacity. Designed for 2.0:1 gear ratio in standard rotation lower units. Direct replacement for Yamaha 2-stroke 75, 80, 85, and 90 HP models produced between 1989 and 2001. Precision machined teeth ensure proper mesh engagement and smooth power transmission to the propeller shaft.