I have a 55hp -3cyl Suzuki that is not pumping water . I dropped the lower unit expecting to find the impeller fried . The impeller was in very good shape , replaced it any way and forced water up the tube to check for a restriction - water flowed well . Reinstalled lower unit - put on earmuffs still no water circulation . Removed thermostat - left therm.cover off , restarted motor- still no water up to the head . Any suggestions will be greatly appreciated . Joe