i have a chrysler 700 skier 709h9a motor...took it it the other week and it ran fine when we left the dock...but when comin bak the engine got louder then all of a sudden it just stop...but the engine was stil running....it was hard puttin it bak in gear so i troll all the way bak to the dock..any suggestion of wat happen...could it b a broken propeller or a lower unit problem?