rear sprocket

What's the smallest rear sprocket that would fit a YZ400 '99 ? Already have a 15T front sprocket, but need more speed.

Check with the name brand sprocket companies. Many advertize that they will make custom sizes. Hopefully they'll also be able to tell you how small they can physically go on that bike.

go to this website.

for a 98 yz 400 it goes down to 44 tooth. but for 99 it only goes down to a 47. i thought these were interchangable. up to yu to do more checking i guess

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