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Sprocket Sizes on an 09KX450F

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I am just wondering if anyone knows the size of the factory sprockets. Looking at changing them out and I want to make sure I get the right ones.

Edited by LawYZ250F
want to add another question

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Stock is 13/50... Really depends on the riding you do as to what chain. I like the x ring because I ride/race off road... O ring is good too for long wear but has a tad bit more friction.

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Wide X/O-ring chains wont fit and grinds against the small knobs on the case,this is at least the case on the 06.I had a thin spacer machined to offset the sprocket and fitted a rk-xw ring chain,which in my opinion is the strongest chain out there.

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I didn't have a problem with my old bike fitting an o or x ring. It was a 05 crf 450r. Could be totally different for this bike, I don't know.

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definitely 13/50. I accidentally ordered a 14/50 and wow, its way too tall for the mx i ride.

If the stock sprockets are new you can just get a new chain and those will last a while.

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