I just bought a set of water muffs and connected them to the outdrive in hopes of starting the engine. I installed them and connected to a garden hose. Started the boat but I did not notice any water coming out through the props. So I immediately turned off the engine. The boat was winterized and I drained all of the anti-freeze earlier. New to this, did I do something wrong or does it have to run for awhile before water comes out of the exhaust?