I had found a possible “sync” mark on the magneto before, but the
throttle pin never even came close to it.
After reading Leroy’s ramblings today, mentioned was a fast idle
adjustment on the side of the tiller handler….. hmmmmmmmm.

I’m feeling pretty stupid now. The knob was cranked “way in”.
I reset it, and it looks like I’ll be able to use the mark now.

I pulled the carb off, and came to the conclusion that I never
had this one apart…….. perhaps it was the parts motor carb
I was thinking of, or I dreamed it!
Anyway, it’s soaking in cleaner now.

The impeller was holding up the motor from turning over.
It was pumping water great when I shut if off. As soon as
I dropped the L.U., the motor turned over fine.
I opened up the impeller housing, and seen no damage to
the impeller, but it was almost like was glued in the housing
at first. The width of the impeller appears to be “just right”.
Not sure what to think about that. Anyone have an impeller
stick in the housing before after sitting a few days?

It has okay compression according to Leroy…… 68 & 69 psi.
The spark looks great, but I’ll probably order new condensers anyway.

Regarding the fuel pump……. The 1971 parts motor had a square fuel pump,
part / casting number 312631.
Will have to research that and replace the pump, or find a repair kit, if available.

I believe I made some progress today with getting the motor running better,
after figuring out the mag to carb sync issue.

I went through the carb, and dressed the low speed needle in the lathe with
some 1200 grit sandpaper on a 6″ machinist rule. Looks much smoother now.

Replaced the fuel line between the fuel pump and carb, as that was “toasty”.

Made a new roller for the mag to throttle shaft mechanism out of Derlin, as
the original nylon? one was quite grooved. The other nylon guide pin
is grooved as well, but that would be a little more involved to make one.

I rechecked the timing sync between cylinders, and that was still “spot on”.

The impeller and housing was cleaned up with alcohol, then I polished up
the inside of the housing with aluminum polish and a little wire wheel in the
Dremel. The impeller plate was previously installed with some Permatex
Aviation sealer under it, and perhaps a wee bit made it into the housing.
I lightly lube the impeller housing with Vaseline and reinstalled it and
the lower unit. It seems to spin over a little “stiff”, but starts okay, and
pumps water fine. I guess I’ll know more after it sits a while before I
know if the impeller “sticks” in the housing again.
I looked back in my Ebay purchases, and while the impeller doesn’t say “aftermarket”
or China, it was only $8.00, so pretty sure it’s not OMC!

It’s still running on the fuel pump that came with the motor, so no clue how old
it is. I took apart the little square pump from the parts motor, and am thinking
about making a diaphragm. May post separately about that mission.

The motor started on three pulls today and runs much better, but it
needs to be ran on the boat again, and with the correct and fresh gas
mixture. Pretty sure it’s 16:1 in the tank, and half from last year!

VIDEO

https://youtu.be/JFOM0gfs_to

Fleetwin, I didn’t touch the “working” fuel pump that’s running the motor.
The little square pump is from my parts motor, and I wanted to rebuild just to have “handy” for when
I need it. I got the pump apart without loosing any springs, but that’s not to say
I’ll ever get it back together again, lol.

On my agenda today is to mix up some 50:1 gas……. something I never have
a use for around here with my mostly pre-1960 collection.

I should just go with 100:0 and be done with this motor, lol.
Like most of my motors, then get ran a time or two, and
back on the rack forever and a day.
I still haven’t tried the motor on the boat since I got it running
better in the barrel……. hopefully I get the urge soon.