I have a 1987 100 HP 2 stroke, 4 cyclinder Johnson that is having trouble maintaining full throttle. Last time I took the boat out the engine would not start, but it had recently rained so I figured that was the root cause of the problem. I pulled off the gasline at the engine and pumped about a half cup of water into a jug before gas started to flow (somehow water finds its way in the tanks). I then pulled off the carbs, drained the water from the bowls, cleaned and reinstalled. The engine idled fine and ran good up to full throttle but after about 10 seconds at full throttle the engine boggs down to a slow idle but picks back up RPMs if you pull back on the throttle (or if left pinned at full throttle will bog, pick back up after about 5 seconds, and then bog again after picking back up speed). It idles fine and runs good at about 75% throttle but for some reason it is getting choked at WOT. Did I somehow mess up the timing/carb adjustments when I pulled the carbs? I also tried an auxilary tank with new gas and still have the same issue. Any thoughts? I would really appreciate it.