I have a 70 evinrude 1976, 3 cyclder.....I just replaced impeller and a coucple of other parts, engine runs fine. the thig is i got water running out the side holes which is good, BUT THERE IS NO WATER COMING from top two holes were some smoke comes out above water, it will start coming out then it stops, is that normal or is it supposed to come out full time??????????? If anyone has this engine or knows please help....DO boat engines have termostats?????.....