What is an outboard engine cowling?
Matthew Wilson
Updated on June 10, 2026
A cowling is the removable covering of a vehicle’s engine, most often found on automobiles, motorcycles, airplanes, and on outboard boat motors. On airplanes, cowlings are used to reduce drag and to cool the engine. On boats, cowlings are a cover for an outboard motor.
What are Yamaha outboard cowlings made of?
A corrosion-resistant aluminum alloy (YDC30, Al–Si alloy series) is used to produce this bottom cowling, which is located at the bottom-most part of an outboard motor’s engine case….Bottom Cowling.
| Product category | Outboard Motors |
|---|---|
| Material | Aluminum alloy (ADC3) |
| Used for | Lower unit |
How do you break in a Yamaha 115 outboard?
For the next 8 hours of run time run the boat at varying speeds and avoid running the boat at wide open throttle for more than 5 minutes. After 10 hours run your boat at normal operational speed. Once you have had your boat and have ran it for 20 hours ,it is time to bring your boat in for a service.
Should an outboard motor be covered?
So don’t cover the motor. If you have your boat shrink-wrapped, ask them to either work around the motor, or leave gaps around the transom so some air can get to the motor.
Can you run your boat motor with a cover on it?
The stylish outboard cover that stays on while you’re running! Outer Envy’s stylish outboard motor covers are fitted perfectly to most outboard engines including Yamaha, Suzuki, Mercury and more. Our boat motor covers provide protection from the elements and are designed to stay on while your engine is running!
How do you break in a new Yamaha Waverunner?
1. First hour – run the motor at varying speeds up to 2000 rpm (approximately half throttle if there is no tachometer). 2. Second hour – accelerate hard enough to put the boat on plane (do not use full throttle) then back off of the throttle but keep the boat on plane.
