"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.