87 Johnson20hp,i have always had a little oil/fuel that collects inside the engine compartment just under the carbs.I have replaced all the zip ties on the fuel lines and manual primer lines.It seems to always be present inside the carb throat and around the bottom of the vertical tube that is perpindicular to the throttle butterfly.Is this normal for a little oil to collect there?The carb was rebuilt last yr,but the furel lines weren't changed.