Re: Evinrude 3 hp Lightwin 3012 diagnosis

[Buccaneer]

Update, Update- I went thru the carb from a 1956 Lightwin,
thorough cleaning, new nozzle and body gasket, and
installed it on the the problematic 1954 Lightwin.
Ran it without the silencer and cowls on, tuned it in,
and ran nice……..
https://youtu.be/5veZkXCZIgc

Put the silencer on and would no longer run right at
any speed…….. seemed like it was surging. Tried
re-adjusting the high and low speed needles,
but I couldn’t get it to run right.
I thought maybe with the silencer on, it was sucking
in exhaust by the back of the engine where it was
thicker. Held a fan up and blew fresh air on
the motor, and it made no difference.
Tried putting a three foot piece of 3/4" ID heater hose
over the end of the silencer to act as a snorkle
to "fresh air", but it would kill the engine!
Tried tuning some more but things just went down
hill…… kept dying, etc.
Took silencer back off, re-tuned the needles, and got
it running good again.
Decided to put a hold on this project until I get the correct J6 plugs,
as I’m running the J8’s now. Also noticed after the fact that
when I put the different carb on, that it’s no longer "synced"
to the mag plate correctly, so that will have to be re-set as well
before I try again.
The silencer is clean as a whistle inside.
Could there be a mechanical defect in the engine that
would cause it not to run okay with the silencer on?
Running out of ideas, lol.

Prepare to be boarded!