+1 IMHO.......If the guy hasn't flown 4-strokes, then a YS is too temperamental, complicated fuel system to understand and difficult to tune for the average glow engine pilot. Most don't realize with a YS to get it properly tuned, you have to wait for the fuel tank to pressurize. Most that haven't owned them, don't even let their engines warm up before tuning, let alone letting a fuel tank pressurize. Saito or OS 4-stroke in the 1.20 size is perfect for the plane.