03 YZ450f questions

Hi, i just brought a used 03 yz450f and i really love the power and everything, and i knwo it's only a four speed, but my friend on his yz125 has a faster top speed then me, like i can accelerate alot faster then him, but like cursing down the paved roads he has a higer top speed, and his bike is stock,

The 125 must be geared awfully high and the 450 awfully low. I have a 97 YZ125 and with stock gearing it is good for around 70MPH. My 04 450 with Stock gearing is good for about a little over 80MPH.

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