On Thu, 5 Oct 2006 20:32:55 -0700, "ULWA"
wrote:

Thank you for the reply's. And Yes... MO = method of operation.
Aviation has way to many Abbr. and Acronyms to be adding to them and
confusing some here. I will keep them to a min.
After years of running 2 strokes, it was always a habit to give the tank a
good shake before
opening the gas. Didn't say it was a good habit....
If oil suspension has not become a concern or problem with the UL rotax's.
I can shorten my preflight list alittle bit for the short rest periods
anyways.
And take the little more uneven ground out to my preflight runups : )

Thank you for your inputs

There are certain additives that can settle out
of a pre-mix. I've just never run into the problem,
myself. So... shake away. The worst that can
happen is you get a hernia! )

Any setting out of additives probably takes more than
three weeks... which should have you thinking about
limiting this OLD fuel to your lawnmower, snow blower,
jet ski, etcetera.

Why....?

Straight from....
http://www.rotaxservice.com/rotax_tips/rotax_feed2.htm

Fuel
Octane rating

We recommend using a "premium" type automotive fuel with an octane
rating of 91, a minimum of impurities and little or no alcohols
(maximum 5%).

Some may have noticed that the Rotax documentation specifies an octane
rating of 90, based on the RON standards used in Europe. This is the
equivalent of an 87 rating under the Canadian AKI standards. A rating
of 87 is indeed considered "regular" fuel, but we still recommend a
"premium" fuel for two reasons:

First, when fuel is premixed with 2-stroke oil, the octane rating is
reduced by about 2 points. An 87 octane fuel would therefore become 85
octane.

Second, fuel evaporates and loses its octane rating when it lays in
your aircraft's fuel tank or in a plastic jug. A "premium", 91 octane
fuel will see its octane rating reduced to unusable levels after as
little as three weeks. Fuel with a lower octane rating would obviously
have an even shorter usable life.

- Barnyard BOb -

“Politics is the only job where the more experience you have, the
worse you get at it. I say never re-elect anybody, including me.”
- Kinky Friedman - Texas Gubernatorial candidate -