im getting a yz125 in a few days and i was just wondering what it tops out at. And my friend said a 125 will keep up with a hayabusa for about 50 feet. I told him he was crazy but ive never seen them race...
that's not a good question unless you specify the sprocket sizes. With a larger rear sprocket the top speed reduces but the acceleration increases. Most people select sprocket size to fit their needs.
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