7. Not Flushing Salt Water from the Engines
What It Does: Many engines take in cooling water from the sea. The water works great. There is a ready supply of it, but it’s corrosive.
Result Of Neglect: If you leave that salty water in the engine when you store your boat, it can corrode and block the engine’s cooling jackets, destroying it.
Cost To Perform: Free! Yamaha technicians say one of the biggest causes of engine failure is failing to hook up a garden hose to the engine and flush it with fresh water.
Penalty: Buy a new outboard in three years (if you’re lucky) instead of 10 or more.