I'm trying to revive a 1971 Johnson 4HP, 4W71D. It's finally running, but the plugs are fouling, I can't seem to get the motor to open up past mid-throttle, and my test barrel water is black with oil. I know I need to adjust the carb settings (and have the great instructions posted here), but would running rich cause that much oil to turn the test barrel water black? I should've done a compression test first, but that's also on my list to do.