The poppet valve should be checked and cleaned too. I don`t understand your ? Motor should idle in gear in the lake at 6-700rpm`s. On a cuff it will idle 900-1000rpm. These Mercury`s are a low pressure cooling system.
ï¿½The world will not be destroyed by those who do evil, but by those who watch them without doing anythingï¿½ Remember what He has done and remember that He is not done yet! GOD IS GOOD