Thanks Mark, I have a couple of those. I find that design rather attractive.
Attractive maybe, functional to a point. That point is displacement. Seems when they get much over 60cc in that design they don't seem to last very well. That design doesn't lend itself to very good cooling.
Poulan, Homelite, Pioneer, Lombard etc all had saws of that horizontal design and they all had problems when going to the 4 and 4.5 cubes class as you see a lot of them with smoked pistons.