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Gearing/sprocket change

3549 Views 6 Replies 5 Participants Last post by  bbarnier, 
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Hello everyone, I am looking to change the gearing/sprockets on my 2020 Z650 (I assume they are the same thing?). I want to increase my top speed but keep (or improve?) acceleration. Is this possible? I have never dealt with this sort of thing before so any tips are appreciated. What do you guys recommend to achieve this?

Thank you in advance
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mattv
No, it's one or the other. More top speed = less acceleration, more acceleration = less top speed.

Also, if you change the sprocket size ratio too much the ECU throws an error code. I went down one tooth on the front and had to revert back to stock.
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mattv said:
No, it's one or the other. More top speed = less acceleration, more acceleration = less top speed.

Also, if you change the sprocket size ratio too much the ECU throws an error code. I went down one tooth on the front and had to revert back to stock.
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How come? One of the most common changes I have found is -1 front and +2 rear
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oldenslow
You've gotten good advice. But, go ahead and try it, and let us know how it turns out.
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mattv
Not So Slim Shady said:
How come? One of the most common changes I have found is -1 front and +2 rear
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-1 front + 2 rear is for supersports/superbikes geared high from the factory. They're geared for top speed.

Your bike is already geared for street.

You can change the gearing if you want to get an ECU flash or a piggyback ECU. It's really not worth it on this bike though, it's already geared low, you'll be shifting gears all the time.
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I just went -3 rear.
Kept front untouched.
great change for urban traffic and some extra mph at top speed.
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bbarnier
eduardopereira5000
What model is your 650K. So you went -3 on the rear sprocket. Did you get any error codes? I would definitely like to do this also. How did the bike drive after that? I can easily take off in 2nd gear with the existing 15 front and 46 rear stock setup.
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