ORIGINAL: Redflier
I received my Senior today, been watching this trying to decided the engine. I am leaning toward OS-70 4 stroke,also thinking of 91 4stroke,which could be considered overkill. Long winter coming up in Wisconsin,lots of time to decide.
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I doubt if you could find a better match for this model running glow power, Redflier. I would go with the .70. It would be easy to change it out later if you decided that you had a need for more power.