RE: Saito FG-20 or 21
Call me a coward but I try never to jump in on a new and relatively untried product especially engines. Did that once many years ago when Royal advertised their pretty .46 glow engine. After running the first tank of fuel the purple cyl. head colour disappeared and then so did the engine's ability to run. Ended up as a rather expensive paper weight. Saito has always offered good engines and it's unfortunate that you are having so much trouble with this new engine. I sure hope Horizon comes good for you one way or the other.