Sprocket size for motocross

What is the best sprocket size to run front/rear on an 04 yz250f for motocross.

i personaly like 13/50

or 13X49

Depends how much you weigh and what type of track: sandy, hilly, hardpack and fast?

Does the rider flow in corners with lots of momentum or are they more point and shoot; depends on ability, too.

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