I bought a used Wr400f, it was plated when I bought it. I got a bunch of goodies with it including a spare back sproket. Turns out that she had a 14-47 on her and the spare was a rear 50. I mostly ride offroad so i put the 50 back on. Feels like I jumped down a full gear , can't keep the front tire down at all, I think I like it . LOL!!!! Which is sprocket is stock for that bike?