quote:Originally posted by Charlie
Straight from Yamaha! Yamaha Outboard FAQs
Question
May I run the engine while using the integral Freshwater Flush adapter on my engine?
Answer
No. The convenient integral Freshwater Flush adapter has been designed for flushing of critical components without running the engine. The Freshwater Flush adapter was not designed to provide adequate cooling water, so the engine can be damaged from overheating. See "May I start the engine out of water?" for more information.
I am not familiar with the 150, but if you are running a "Saltwater Series" flushing is not as important as it used to be! (I'll probably catch some flack of that statement!)
I have been running dual Merc 225 Saltwater Series (made by Yamaha) and as my boat sets in the water year round, I don't worry about flushing anymore. Pull them out of the water for maintenance once or twice a year and flush then. I haven't had any problems in 5 years, but again... they are the Saltwater Series!