I have a 115 2cyc merc, 94 mod. I have had an issue of clogging up the fitting of wp discharge hole for the water pump. I took it off and got a 3/8 hose barb to some threaded fitting, and mounted on engine. This opened the discharge from about a 1/16 to about 1/4 or 5/16. I had a friend tell me that the cooling system requires this back pressure to cool properly. From my research, I have never found that, but I asked BPS parts, and he said he didn't suggest this. Does the cooling system require a back pressure, and would I have issues if I increased the diameter of discharge hole to about a 1/4"? I kept the fitting, so I can replace it. I also put a clear line on, so I can see if it is clogged.
Edited by SlabHappy (09/20/17 09:36 PM)