Yamaha 69P-45300-01-4D Lower Unit Assembly Short Shaft

The 69P-45300-01-4D lower unit assembly is a short shaft (S) gearcase designed for Yamaha 2-stroke outboard motors rated at 25 and 30 horsepower. The unit integrates the gear housing, drive shaft, propeller shaft, forward and reverse gears, and shifting mechanism into a single replaceable assembly. Constructed from corrosion-resistant aluminum alloy, the housing withstands continuous saltwater exposure and high torque loads typical of planing hull applications. The gear set provides a 2.08:1 reduction ratio (13:27 teeth) to match the engine power curve. The assembly includes the water pump housing and impeller drive for engine cooling. Direct OEM interchange for part numbers 69P-45300-00-4D, 69P-45300-03-8D, 69P-45300-05-8D, 69P-45300-06-8D, and 69P-45300-07-8D. Cross-references aftermarket number 61N-45300. Compatible with Yamaha outboard models E25BMH, E30HMH, 25BMH, 30HMH, 30HWH, 25BW, 30HW, 25BWC, and 30HWC series. Installation requires standard transom height of 15 inches (381 mm).