Please forgive but I have to ask..

I just picked up a 98 15 hp Evinrude (Serial # HIPXM0016211). I had it running in a barrel for a few minutes and no water was "pissing" out of the tell tale and it seemed to be some air preasure comming from it as well. With normal pressure comming from the exhaust.

What is the average time frame that the thermostat takes to open before the engine will start "peing"? I am used to a 225EFI that starts right away with enough preasure to strip paint, so I am a bit werry on the time..

I am going to change out the impeller anyway, just was curios on the time, as well as the air preasure comming from the tell tale?

Thanks!!!