Yamaha offers a favorite line of four-cylinder 4 Stroke Outboard Motor which are used in a broad assortment of installations in the fresh and saltwater all around the world. From pontoons to centre consoles, bass ships to work skiffs and even water taxis, they are fantastic performers and real workhorses. The most popular would be the 90, 115 and 150-horsepower versions and several are employed in climates where they're taken out of service for the winter months.
While we always recommend getting your Outboard Motor 4 Stroke Boat Engine winterized with a certified Yamaha dealer when possible, these motors are intended to make the process easy enough for owners to do the task themselves. We requested Pete Reils, a certified Yamaha technician at Garden State Marina at Pt. Pleasant, New Jersey to provide a step-by-step tutorial regarding how you can winterize your engine(s).
Extract from https://yamahaoutboards.com/en-us/utility/news