Join Date: Nov 2009
Thanked 48 Times in 47 Posts
Rep Power: 8
Re: Run our 2012 Honda 9.9 hp outboard up out of the water?
The Honda 9.9 manual says "Do not run the engine." when flushing with the Honda garden hose fitting. It could be for safety reasons or it might be a problem (bypassing a thermostat?) for the motor.