I have a 200 merc ('93) which is fine at idle but temp increases as rpm goes up. Water pump, housing, plugs, etc all changed with no difference. I tried new stats with no change. I pulled the stats out with no change. Now I am wondering about this poppet valve. If I have no stats in now, will the decrease in water back pressure cause this valve to close more...and if I can get to this valve(s) and remove or replace it, will I be better off running with stats or without.
Also, does anyone have any idea where this poppet valve is on this motor? Someone told me on the starboard side below the block but how do you get to it?
Also, does anyone have any idea where this poppet valve is on this motor? Someone told me on the starboard side below the block but how do you get to it?