What are your opinions of a 95ax vs 75ax in terms of engine design? Do you think that a 2 stroke in the 60-75 size is generally a more reliable design than a 2 stroke in the 90 size? It seems I've heard people having issues with the 91FX. I also had a SK90 and I never could get it to run just right. I'm wondering if 60size engines is just a general "sweet spot" for 2 strokes?