Can anyone confirm advise me where the cooling water is supposed to exit my 4hp, only just purchased this as spare engine, when seller demonstrated it he showed it running in tub and engine coolant was coming out of exhaust at rear, however it was suggested by someone that there is another outlet under rear of powerhead and both should be showing coolant? I have examined engine at length and can find no other coolant outlet on powerhead?can anyone confirm please? thank you, J.B.D.