Hello.I just recently bought new boat with Suzuki DF90 2006 model.<br />I noticed like gas outlet near of water jet outlet.<br />(aft side of engine)<br />I did not put attention from very beginning but my feeling it was a cap on this outlet .Now I can see smoke especially when just started engine and like exhaust gas running out from this hole.<br /><br />What is a purpose of this opening ?<br />Again , this port located on aft side (propeller side) just near of water control jet.(where water coming out for control of cooling)<br />Should this opening to be closed or not?<br />Thanks in advance for advce.