I have a cr500 motor in my 250r and the 14 tooth front and 39 tooth rear are just too much, 1st gear cruising is like lugging 3rd gear on my 310 speedwise. I need to slow this thing down a smidge, whats the largest sprocket that fits the 250r hub? any other atv's that share the same hub bolt pattern? I saw 42 tooth rears but I was hoping to jump maybe even one or two more teeth up from there. TIA!