My 1978 mercuriser 160 inline six overheats when I run less than 1500 rpms (about 5mph), but runs fine above 1500 rpms. I've already replaced water pump/impeller and thermostat.
I'm new to this boat.. is this normal or is there somthing else I should be checking?
I'm new to this boat.. is this normal or is there somthing else I should be checking?