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That is because with all due respect, you are missing the point. The XT's have a very torquey single cyl engine which is heavily restricted from factory to comply with emissione regulations and all that bollx. Modding an XT is not for the purpose of doing 160mph on the clock, but is done so you can render the full performance which it was designed for, without the intrinsecate cats restrictors in the cans (have you ever seen a standard can cut open? Well let me tell you you couldn't fit a pen in there so much is the layout of deflectors and the space taken by the cat converter), and then there is a very choked up air box to deal with that reduces the air intake, hence fitting the DNA stage one & two and the removal of the snorkel alone makes your front wheel come up at the throttle. The gearing is another different issue, but also that factor means that the bike is designed to be powerful on low regimes and not on full pelt.
Altering the sprocket sizes might change things but the overall result would enhance one aspect and compromise another. Click on the attached excel file and then experiment with changing sprocket sizes and see what the result is in speed vs torque, then you will be able to understand what does what.
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