I was holding back too. I believe the dry weight of the IO-240 is listed at 246#. Just like Bruce I am very happy with the performance of the aircraft with the IO-240 on my model 5 Kitfox. I think I ended up with one of the lightest planes with the IO-240. I have a useful load around 660# and over 500# with full fuel. My normal flying CG is always near the front limit (me and fuel), but I can almost put the full 150# of cargo in the back and not be out the aft CG limit.