Overheat

have two 02 250 two Stroke Salt Water. The engines are brand new never used before. When I start both engines, the temp come up slowly, and alarm come on. I use yamaha ear muff, and garden hose with plenty of clean water.
The water from the engine doenst come out with presure

What is going on? I mean, both engines are new, never used. Can the impeller be damaged for been long time stored?

Thanks

[boats.net]

The V6 engines will overheat on water hose flusher's, can't get enough water through garden hose.

First, thanks for your help.
I will put the boat on the water and I ll try. However, how can I flush with fresh water my engines? If the water hose flusher's doesnt work on my V6?

Thanks again

[boats.net]

Get the largest garden hose you can find and use faucet closes to your water pump.