I just received my chain and sprocket set from rocky mountain MC. My bike has had a 13/50 and I've been happy with that. I ordered the stock size which is 14/52 with stock chain length and it won't fit. The sprocket is so huge it barely even fits in the chain guide and the wheel won't slide forward enough to get the chain ends connected. What am I missing here, how does a 52 fit? What's strange is that the new chain is the same length as my old chain with 13/50. 2004 250exc BTW.