oops, was trying to be witty about the pitfalls of the YS, not bash. went back and re-read it, can see where you got the notion.
I like my YS's, gobs of brute power. But after dealing with them since 1994 until now, I <love> the new Saito - none of the hassles, and very close to the same power - If I'm worried about tank placement a pump/regulator solves the problem, but I've never had an issue with it. As for your not dealing with any maintenance issues, there seems to be two camps of YS owners- those than run perfectly from the get go and never have a problem, and those that have problems from day one and never ever run right. I've owned both types, and kept the one that runs great, had it since 1995, and all I've ever had to do with it is replace the diaphragm about every two years - that motor probably has had more than 400 gallons of glow fuel through it, anwhere from 10-30% nitro, I'll never sell the motor, and I'll always have a plane to put it in, just not the UCD, <personally> I dont think its as good a match as the Saito 100 for <this> application. My only real complaint about the YS are the care and feeding issues with the pressurized fuel system and the parts involved to make it pressurized - important things for a potential YS customer to know about, the average RC enthusiast is not going to be able to work on this motor without some experienced help.
oh, just for giggles i put <my> YS 120/w aftermarket muffler, and <my> Saito 100/w included (altho heavy) muffler on the scale. saito - 25oz, YS 38oz, you're right, its not a full pound, only 13 ounces difference.

I'm not putting down the YS, just extending my personal experiences for others to read. One should know everything there is to know before plunking down hard earned cash. Sorry if I offended you.