I have a 1998 johnson that I just converted to 50:1 mixture in the tank. Took the VRO off. I had the sides off and put them back on with care. I have notice that when I run for a long time when I get back there is black oil/gas small amount running down the outside of motor coming from the engine department. I had a small hose the cracked which I reconnected that sits on the bottom of the black intake that goes into the 3 carbs. thought this was the problem, but it is still doing it. It almost looks like it is residue from unburnt gas or something maybe should be coming out the exhaust...........will take sides off tonight and run it with the earmuffs on to where it is coming from. 