Well, if you’re going to put it that way 🙂 I’ll take a shot at it.
1st the disclaimer and some background: As stated earlier, I have done this mod on 2 Evinrudes, a ’56 Big Twin 30 and a ’66 Ski Twin 33. I did it because there was so much unburned oil bubbling up in the exhaust at idle that I thought my lower unit had a leak. I drained the lower unit and determined the lower unit seals were fine. I figured, correctly, that the oil was coming from the exhaust cavity. It was draining into the cavity from the crankcase.
To perform the mod, you must remove a small cover located to the lower right of the carb, close to the bottom of the crankcase. I placed a screwdriver pointing to the cover in the pic I took.
I drilled and tapped that cover in the lower corner of it, looking at the underside first to determine the best location. I then screwed in a barbed fitting which I sealed in place with JB Weld. FWIW, the cover on the ’56 Big Twin is identical to the cover on the ’66 Ski Twin. The only difference is the amount of available space for the fitting. I had to angle it on the ’66 vs straight out on the ’56 which has more space available.
There is a spacer, of sorts under the cover which also has to be removed in order to access the drain hole located underneath. I plugged that hole with silicone. Plugging it forces the unburned fuel/oil to drain out through the barbed fitting. I reinstalled the spacer and the cover before connecting a hose to the barbed end and running it to a container that I purchased at a "Dollar" type store.
I was surprised at just how much unburned fuel/oil mix collects into the jug, especially at low RPM. I was especially happy that there were no longer any globules of oil bubbling up in the exhaust.
Let the comments begin. 🙂