Switch Box / Power Pack – Fits Mercury & Force 3 & 6 Cyl 50-275 HP (Replaces 332-7778A12, 332-7778A9, 332-7778A6) 340HP Open the seacock and check

Open the seacock and check for leaks after starting the engine

Carefully slip the cover over the engine from top to bottom

How do I know if this lower unit fits my Yamaha engine

This is a an open

It is good practice to inspect seals whenever you change your lower unit gear lube (typically annually or every 100 hours)

Switch Box / Power Pack – Fits Mercury & Force 3 & 6 Cyl 50-275 HP (Replaces 332-7778A12, 332-7778A9, 332-7778A6) 340HP Open the seacock and checkProduct Details This aftermarket Switch Box Power Pack is engineered for Mercury & Force 3 & 6 cylinder outboards from 50 275 HP, primarily serving models from the 1980s to 2000s equipped with an Alternator Discharge Ignition (ADI) system. It ensures reliable spark and engine timing for consistent performance. It serves as a direct interchange for Sierra 18 5775, CDI 114 7778, and several Mercury part numbers including 332 7778A12, 332 7778A9, and 332