Yamaha - Gear set - 6CF-45550-00-00Yamaha Gear Set Lower Unit Gear Set 6CF 45550 00 00 Overview When youre rebuilding a Yamaha lower unit, the gear set is where everything either comes together or falls apart. If one gear is worn, it usually affects the whole system, and youll feel it in noise, shifting, and overall performance. Ive worked on units where replacing the full gear set brought everything back to smooth, quiet operation. When its right, the drivetrain runs clean and you can