"Joe" wrote in message .. .
"basskisser" wrote in message
om...
"Joe" wrote in message
...
"trainfan1" wrote in message
...
WRH wrote:
50:1
That's 1 pint oil added to 6 gal gas. Do your self a favor and only
use
good
oil and high test gas.

Don't bother with high test gas... it could cause cause starting &
idling problems as there is usually an additive package included that
just isn't required for an outboard. The minimum octane rating for
1973
Evinrudes is 80.

Rob

Plus, unlike a 4 stroke, a two stroke will begin to lose power as the
octane
is increased above the detonation point.

At the advice of an OMC tech who used to post here, I started using
high test in my 1973 135 Evinrude, and it made a hell of a difference.
I had trouble getting the thing to idle smoothly in gear. I rebuilt
the carbs, did a link and sync, etc. The high test instantly cured my
idle problem, and ran great at wot.

If true, (coming for you unlikely) the higher octane is most likely helping
to overcome another problem you have with your motor.
Boosting octane above the minimum required in a stock outboard *is* a waste
of money *and* will hurt performance.

Admixtures aren't the same now, as they were in 1973. Engine has good
compression, has been pressure tested (w/leakdown test) with good
results. Rebuilt carbs, link/sync. OMC technician knew of the problem,
said it was very common in those motors, suggested using high test. It
will idle all day in gear now. Last year, out of curiousity, I went
back to regular unleaded, and when I tried it several times, it acted
like it did prior to high test. So, there you go. Now, of course,
seeing how you think so highly of yourself, you'll disagree, but, the
motor is on the back of MY boat, and high test is the way to go.
Again, it was an OMC tech who gave me the idea.