RE: Welcome to Club SAITO !
You might also try flipping the prop backwards (using a chicken stick or heavy glove); it likely will fire and bounce back and run the right way. This is the only way I could hand start a friend's new Saito 150. Before that, flipping it the "right" way, it backfired and really stung, even through a heavy glove. I like to hand start all of my engines, even the big ones.