I bought a synchrospark from CH for my Ryobi. You couldn't ask for an easier starting enigne.

I'd just choke it about 3 or 4 turns and then turn on the ignition. 2-3 flips and it would kick off and tick over like a swiss watch.

Yes, it costs a few bucks, but IMO it's well worth it. My ryobi idled so slow, and transition was perfect. Max power was just as good as the magneto. Can't remember the exact numbers, but I tried a 16-10, 18-6 and an 18-8. All of those props made good thrust.

I put a Walbro WT 438 carb on mine. It's a bolt on part, and it's the same size as the intake hole in the backplate. The stock carb is a bit smaller than the intake hole.