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yz250f gearing question.

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i got a used stock 2003 yz250f but it has an after market pipe,standard jetting(178 main jet and 40 pilot) and on the rear sprocket it has a 50t and a 13t in the front.standard sizing is 13/48 so it has 2 extra teeth on the rear now.i have a spare 48.which should i run and why?what are the benfits of each?

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My XR250R stock is 13/48 and I changed to 13/50. It slows the bike down just a little bit in each gear, and increases the torque by the same amount. I ride tight trails with some steep hills, so I'm rarely riding fast and like the low-end grunt torque.

You can use this to give you some idea for the differences: www.sprocketcalculator.com

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