That engine Kyle was using is a YS 120 FZ. It turns the 16-6 over 11,000 rpm. So he said when I asked him.

I'm not Saito bashing here, but I have two friends who each have a 150. One is bran new, and it's down for repairs. The bearings are shot. The other is older, but with little total time. It is starting to make some very strange noises that we can't figure out. He needs to pull it down to find the problem before flying again. I only mention this because all model engines are subject to issues. The good news is that the 2300 is much cheaper to start from, and it's issues deal mostly with the carb and break-in.

Personally, if I were going to get serious about 3D, I would only use YS. Because I'm more of a sunday sport flyer, the 2300 is perfect for me.