RE: Engine suggestions for a Four Star 60?
I believe that the 4stroke is heavier myth is just that... The OS 61 FX weights 23.6 OZ with muffler and the Magnum 91 4 Stroke weighs 22.3 oz with muffler.
I would go with a MAgnum 91 RFS (4 stroke). I've got two and a buddy has one in a 4*60 - it's a great combo.