The number one reason and I forgot to mention this in my initial post was that you have to start the new pumped 91 with an electrict starter.

I don't like to haul all that stuff with me and I really like start all my four strokes by back spinning the spinner or if you like bouncing the pistion off of the compression made by the engine. Every four stroke I have every owned, no matter what the brand, as started very easily this way, and I might add very safely.

For me, haveing to have a starter and a battery, is just one more thing, I would probably forget to bring to field. We've all done it, drive all the way to the flying sight and forget your transmitter, wing, plane, etc........