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transmission ratio 06 v 07 yz250f

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I was thinking about getting a 49 tooth rear sprocket for my '06 since that is what the 07-09s run and I would also like a little more low end. my question is, did they change anything in the transmission, and using the 49 tooth just to make up for it or did they just decide that the 49 tooth is a better fit for it and helps more? so i guess I just wanted some input on changing to a 13/49

thanks guys

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Transmissions are the same, just a lot of people liked the 49 tooth rear better, so Yamaha made that standard.

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