Rocketman,
You are absolutely right about the YS as it is pumped. However the tank position is awfully high on the UCD. Some people have trouble with the Saito, some do not. I for one did with fuel pouring out of the carb and the cure was the installation of a Cline fuel regulator. The bonus was also being able to move the tank back to the CG. After my bud cumn thru went to a YS 110 and raved about the substantial difference in power I followed suit and have never looked back. So far I have purchased 1 63 FZ-S, 2 110FZ'S and a 140FZ and although the Saitos are fine engines I am sold on YS Performance. That being said, I sold the 63 FZ-S and both 110'S and now only have the 140FZ in my Wildhare Edge 73" 540T. The money for the other three is going for a DA 50R and a 28% airframe. I slapped my Saito Fa-100 into the UCD and it's now at our LHS on consignment.

If anyone is interested I have a NIB UCD 60 available for a real reasonable price. Shoot me a PM to discuss the details before I put it in the Marketplace.