I've had a 50t sitting around for over a year that I had when I run a 270 kit, now i have a stock piston I'm wondering how the 50t will work. How different is a 50 from a 51? I ride only mx tracks. I liked the 50 with the 270 cause I could carry gears longer and use 3rd through most corners. I don't feel like buying another sprocket when I have a brand new 50 still in packaging.