hi guys,bought a boat with a 92 force 50 engine.<br />had her put in our marina, went to use her for a days fishing did not get far as the engine got very hot very quickly,shut her down and got back on the berth, there was no water from the pee hole,the seller asured us that their was a new impeller plugs etc, i managed to get the lower unit off checked the impeller which was perfect,reassembled it tried the engine and i had a good spray of water through the pee hole, also the thermostat was stuck open,now for my question, what could have caused the lack of cooling water,the engine seems to run ok now if a little rough at tickover and sometimes cuts out,will i have done any further damage to the powerhead,what checks can i make.thanks in advance and sorry for the story. 
