I have been reading the posts on the 02-03 F225 corrosion issue and many have been flushing the motor with the hose connection while running the engine. Some have said not to, so I called the Yamaha outboard line and they said you do not run the motor with the hose flush connection. This is designed to be flushed with the motor out of the water and run 15-20 minutes. I asked about the thermostat not being open and he stated there is a designed small bypass to flush the entire motor. You run the risk of melting the impellers and worse case, overheating the motor by running on the hose connection.[/b]