The lifespan of a Yamaha F150LB outboard motor depends on several factors, including usage patterns, maintenance practices, and operating conditions. However, Yamaha is known for producing reliable and durable outboard motors that can last for many years when properly maintained.

According to Yamaha, their outboard motors are designed to last up to 10,000 hours of use with proper maintenance. However, this is a general guideline and actual lifespan can vary depending on the factors mentioned above.

To ensure that your Yamaha F150LB outboard motor lasts as long as possible, it is important to follow the manufacturer's recommended maintenance schedule. This includes regular oil changes, inspection and cleaning of the cooling system, inspection of the propeller and steering system, and other routine maintenance tasks. It is also important to use the correct fuel and oil types and to avoid overloading the motor.

In addition to regular maintenance, it is also important to operate the motor within its recommended RPM range and to avoid operating at high speeds for extended periods of time. Operating the motor at high speeds for extended periods can cause excessive wear and tear and reduce the lifespan of the motor.

Overall, a well-maintained Yamaha F150LB outboard motor can last for many years and provide reliable and efficient performance throughout its lifespan. By following the manufacturer's recommended maintenance schedule and operating the motor properly, you can ensure that your outboard motor lasts as long as possible.