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
Prepare to be boarded!