I have had 3 YS 4 strokes. All were great engines. My favorite combo was the YS 1.10FZ on my Funtana S90. The guys who usually complain about tuning the YS are the guys who don't spend the time to understand them and never realize that one of the needles is backwards to conventional tuning wisdom. They usually also do not understand that the blade width of a screwdriver is enough of an adjustment when tuning in, most guys are whipping the needles around so much they wear the threads out!
If I were going back to glow, I'd buy a YS is a millisecond. Best engines I have ever owned.
