berry...
i would run your engine with 91 octane and get the amz oil 100:1 oil that they carry... works well in all 2 stroke engines... mostly in the winter like were your located.. what happens is with most oils when the temperature drops to below 60's the oil in your gas can will seperate and it will also do so in your tank on the plane.. and it will gum up the carb... you'll notice on cold starts in the winter that it will take a while to fire up... thats why... running 91 octane in all engines will make it run cooler and will give you more power also... running your engine with that will make it run strong for a long time with out giving the motor any premature wear on the rings... look into the oil and read about it on the amz oil website... i sell all different tips of oils at my shop including amz oil and for me and running it personally it has been the best..

Josh