Matt asked:
    > What's the practical upper operational limit to how much 2-stroke oil
    > can be added to the fuel and still have reliable operation?

   The long-term practical limit is lower than the immediate practical
   limit. I suspect that you can add enough 2-stroke to cause "immediate"
   problems as you described (fouling, pre-ignition/detonation, etc.), but
   you can have a problem long term if you add too much. Some of the
   excess
   makes its way into the oil pan (via the oil scrapers), so long term
   excessive use of 2-stroke will cause your oil pan to overflow. I think
   Tracy has had "mysterious" oil level increases that he's attributed to
   excessive premix.

   Russell Kent


That's a relatively benign behavior as well.  Check the oil before every
flight should keep you in the ballpark.


Thanks,

Matt-



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