Earlier in the day when I was trying to figure out the gas line connection,
and searching on the forum, the only thing that came to mind was
a “Bayonet” fitting. As I was typing the query above, “Banjo” came
to mind, and Lo and Behold, I found one of my old post
on an Evinrude Sportfour with a similar style set-up.
I doubt if they take the same bolt, but these photos might allow
me to cobble something up!
https://www.aomci.org/forums/topic/1938-evinrude-sportfour-fuel-line-connection/

Thanks, Tubs,

I’m in the process of trying to make a bolt out of brass.
Perhaps not the best material for the application, but easy to machine.
If all else fails, I’ll take the front engine cover off the Sportfour to
see if it fits, and perhaps use it for a pattern to make a better one.

Tubs, I “think” I have a working bolt now.
It took me most of the day, but it snugs up the
banjo fitting nice, with little pressure.
I still have to make a screen for it, and perhaps try
it out tomorrow.
Thanks.

Well, my “banjo” bolt seem to work great, but I did have a slow drip.
A worse problem was gas bubbling out around the poppet valve cover.

Looking back in my records, I see that I ended up installing different pistons,
rods, new rings, etc., as the original pistons had a lot of pin slop.
It might take a while to get the new rings to set in, but the compression seems
good.

It wouldn’t stay running in the video so I put the camera away.
Came back to it a few minutes later, started on the first pull,
and stayed running, but it quit pumping water after a couple
of minutes so I shut it down. 🙁
It stayed running with the carb needle about 1/8th turn open.

Took the motor back to the workbench and took the carb back off
to address the fuel leaks. The Poppet valve “Stop” (cork) was a good
5/16″ above the valve stem when closed. It seem like way too big
a gap, so I made a new stop out of Derlin rod, and the gap is now
1/8″. Any idea if there’s a general rule as far as “gap” on these poppet valve
carbs? Does the gap even matter as long as the valve can open a little way?

I didn’t see much of anything for sea weed plugging the pump screens,
and while my test barrel is pretty murky, there shouldn’t be much sea weed!
I blew into the tell-tale outlet with my air hose, and there didn’t seem to be
any obstruction. Not sure if the metal impeller sheared a pin, or if it’s just
time to clean the test barrel.
I didn’t get to re-try the motor afterward, as it decided to rain the rest of the afternoon.

VIDEO
https://youtu.be/aXjdSYGlvJ0