I have a Miller 24v started, it's tough to use, makes starting a two man job. Since I switched to EI I don't need a starter I hand flip everything. My buddy's been flying Ryobi's for 10 years , he nearly fainted when I one flipped my Ryobi to life.
This is the IE I'm using:
http://lsproengines.com/lspro_012.htm
I've converted 3 Ryobi's, Brison(sp?), and a Sachs they all run and start great. I've got a 100cc Quadra and a Fuji64a I'm going to convert next.