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Hey guys I recently got my 2021 ZX6r KRT flashed and tuned. I have seen people get theirs around 175 mph. for some reason I am only hitting 152-154. Is it the tune or do I actually have to change the sprockets. Please let me know what you guys think I am really interested on knowing what more do I have to do.
 

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1993 Zx-7 L Model, 2006 ZX-10R
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If that's 175 indicated, the speedometer is inaccurate at those speeds. You'll need to go +1/-4 to get top end speed out of it. You'll also need a speed-o-healer to adjust your speedometer to read more accurately.

E.g. I did 170mph indicated on my zx7. After accounting for a 15% discrepancy, that comes out to be about 145mph corrected.

Edit: you'll also notice your first gear is going to be super tall. You're probably going to wear your clutch out faster
 
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