I need help getting some information on this motor.<br /><br />Model: GR-72D<br />S/N: J3553120<br /><br />What year/years of manufacture?<br />What Ratio of gas to oil?<br />Spark Plug gap (Champion J6C)?<br /><br />Motor has long shaft and is used on a sail boat. Runs real good and I want to...
