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My new rear sprocket is a 44T. I though I was going up two teeth from stock but when I took the old one off it was marked 46T. (If I get too stir crazy from no riding I"ll count them)So it looks like I went down two teeth from an aftermarket sprocket.
One question, what is the standard size, is it as Sprok said, 17/42?
I will go back to that if it is.
know this is an old thread, but yes a 17 tooth front sproket and a 42 tooth rear sproket are the factory tooth counts. For what its worth, when I took possesion of my 93 it had a 46 tooth rear sprocket and I replaced it with a 44 when I replaced the chain.
I can't tell a difference.