When I get home I'll take a look at my 60 to see how the carb goes together. It's been a while since I played with my YS 2 strokes. The only thing that pops into mind is the barrel lock bolt on the top of the carb body being too tight......Like I said I'll look tonight when I get home.

I had a YS 45 FS last year that I sold to buddy of mine. Had it on my Dago Red with a 7.5 pipe and it screamed. Don't remember what prop I wound up using....maybe 9X9...took some runway to get her off. It will run well on 15% sport fuel but the YS 20/20 blend for the four strokes really perks it up. I woud try a 10X8 to start.

You'll like the combo when you get it sorted out.....I liked mine until I caught a wingtip on take off. The plane is almost repaired now and I am considering a piped Rossi 60, A YS RE 60 or a Tower 76 for it.