How to Change the Oil on a Yamaha 225hp Four-Stroke Boat Motor?

Answer The only oil you ever have to change on the four-stroke Yamaha 225 hp four-stroke is the oil in the gear case. The motor uses an oil-injection system to mix the oil into the gasoline precisely. The... Read More »

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How to Troubleshoot a Yamaha 4-Stroke Outboard Motor?

Yamaha offers consumers great variety with its four-stroke outboard motor lineup. In 2011 alone, the company featured 10 different four-stroke makes with dozens of different models. Each had unique... Read More »

How fast will a 115 HP Yamaha boat motor go?

While the horsepower rating of a boat's engine is a large factor in how fast it will travel, it is hardly the only one. In order to properly estimate the speed of a boat, a great deal more informat... Read More »

How to Change the Oil on a Yamaha T50 Outboard Motor?

It's a dirty affair. As the oil drains from the Yamaha T50 outboard motor, it runs down the back of the motor. When it reaches the top of the cavitation plate above the propeller, there's a groove ... Read More »

How to Change the Water Impeller on a 15-HP Boat Motor?

The tiny rubber circle with multiple fan ribs called an impeller is a minute item in a boat's engine drive system that must be inspected regularly, preferably annually, for damage and wear. A 15-HP... Read More »