OK here goes... I bought a used 1990 V-6 200hp Merc powerhead from a local here in FL who builds race engines. The guy was going to rebuild it, but he sold it to me instead. At some point the carbs were removed. When he sold it to me, he said he would put the carbs back on before he shipped it. I had the powerhead rebuilt. I took the carbs apart myself and the jets are all frozen up. All 3 carbs are WH48's. According to my Seloc's manual, the 1990 200hp Mercs came with 3 WH46's or 3 WH49's. WH48's came on the 150hp. Now I'm thinking either the guy sold me a 150hp block or he put the wrong carbs back on. So I had the local Merc dealer look up the serial # and he said that all he could tell me is that the block could be from a 1989 or 1990 135hp - 200hp... not much help. Now since the jets in the WH48's are all bad, I decided to replace all 3 carbs if I could find 3 good used ones. Now I have no idea as to what the correct carbs are! I started looking around in the local papers for someone who had a blown powerhead. I found 3 WH30's from a 1996 175hp that are in good condition. They are dual floats like the WH48's. My question is will they work and how do I go about finding the correct jet sizes. ANY help would be GREATLY appreciated!
