Re: Unburned fuel

[frankr]

1st, you have to realize that all two-stroke engines emit SOME oil out the exhaust. If they did not, there would be no lubrication in the piston/rings/cylinders in the exhaust port area. But it is a matter of how much emissions bother people. I think your real question is when did they stop putting crankcase drains in OMC motors. It wasn’t an across the board swoop. More of a phase-in as technologies developed. But I’d say the efforts began in the late 1960’s. The 1968 55hp looper would be a good example.

I agree, if you are concerned, use 100% Synthetic outboard oil, then point out to critics where it says bio-degradable on the jug. Won’t do any good, but might shut them up long enough to make a hasty departure.