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Discussion Starter · #1 ·
So I've had my 2010 Z for 6 months, and while it's the best ride I've ever experienced, it's actually comfortable over such a wide range of rpm that I find myself searching for a 7th gear every time I'm on the highway. Anybody looked into switching out 6th gear with something with fewer teeth?
 

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The bike really could use more overdrive. I find myself trying to upshift while in sixth all the time. Having a gear indicator would help also. For now I'm looking at changing the rear sprocket but I would also like to know about changing sixth.
Chris
 

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It's pretty amazing what changing the sprocket will do. I'd probably try that before I change any gears. At worst, it'll cost you $50 or so for the sprocket.
 

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I'm with tomohawk on this one.....try subtracting a tooth off the rear and see what happens...adding a tooth to the front would be even cheaper but would probably be too much and diminish low end torque
 

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I highly recomend a gear indicator..love mine i was doin the 7th gear shift all the time.
Especially comming off my sv650.
Thought about taller gearing but who wants to give up the blazing acceleration with the factory gearing.NOT ME.
The Gi pro gear indicator was my first mod and have never thought twice about it.
Money well spent in my eyes and less clutch wear goin for 7th maybe they sould put a 7th overdrive would be nice am i wrong?
 

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got a 1 tooth bigger for the front. with the added hp from the mods am going to try it next week. am also considering a reduction in rear. was looking at my zrx 1200 book and comparing the 2 bikes.zrx 17/42(2.47) primary reduction ratio 1.637. z1000 15/42(2.80) zrx 1st-2.733, 2nd-1.947,3rd-1.478,4th- 1.192, 5th-1.035 z1000 1st- 2.600, 2nd-1.950, 3rd-1.600, 4th-1.389, 5th-1.238, 6th-1.138. not sure how the z 's motor will actually perform with different gearing. can't find my dyno sheet for the modded zrx. it was run on the same dyno with the same operator as the z1000. it was posted on one of the zrx forums am still looking for it. will post if i find it.:screwy::screwy::screwy:
 

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Discussion Starter · #8 ·
I think the new Ninja1000 actually also has a smaller rear - Kawi must have gotten some similar feedback - and it actually has a better 0-60 than the Z!

But jrick56, definitely keep us all posted on how the switch turns out.
 

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The Ninja 1000 is geared 15/41 vs 15/42 on the Z. It's not enough difference in my opinion. Another person I know was at one of the Kawasaki events and the factory guys suggested going to a 39T rear with the stock 15T front. I'm considering going with the 16T front on mine and leaving the 41T rear.
 

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not sure but it would seem logical since the speed sensor reads of the shaft the front sprocket bolts to. i'll find out soon.:screwy::screwy::screwy:
 

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Discussion Starter · #14 ·
So since the stock speedo over estimates by 5-10% anyway, I should actually get a more accurate reading!

The more I think about it, the more I think a significant change in the rear --say a 39T--could be just what I need.

Re: concerns over losing low-end torque, couldn't I fix the problem by switching out some of my lower gears to something smaller, too?
If the front-to-back sprocket tooth ratio was similar to stock for the lower gears I could match the stock acceleration from stop, and I could still keep a steady cruise in top gear... Thoughts?
 

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sounds like alot of work. when i change i'll get a speedohealer with the extra power i'm sure the lowned will still be great. right now it over powres the tire in first three gears.:screwy::screwy::screwy:
 

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Re: concerns over losing low-end torque, couldn't I fix the problem by switching out some of my lower gears to something smaller, too? If the front-to-back sprocket tooth ratio was similar to stock for the lower gears I could match the stock acceleration from stop, and I could still keep a steady cruise in top gear... Thoughts?
maybe I'm not following you, but yeah. Changing either sprocket only results in adjusting the final drive ratio. The only way to modify the individual gears is to rebuild the entire transmission. That's taking it way too far. As it is, it'd take a huge change in the final drive ratio to make a painful change to your acceleration - this engine has gobs of torque. Pick up a sprocket or two and give it a try. It's not an expensive test.
 

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The Ninja 1000 is geared 15/41 vs 15/42 on the Z. It's not enough difference in my opinion. Another person I know was at one of the Kawasaki events and the factory guys suggested going to a 39T rear with the stock 15T front. I'm considering going with the 16T front on mine and leaving the 41T rear.
hey man, was reading thru these gearing pages and stuff and saw you wanted to go to a 16 front and 41 rear, did you do it? if so how do you like it? still enuf power to pull the front end up whenever? i just ordered a 39/16 combo, i cruise more than rip around town. thanks in advance.
 

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So since the stock speedo over estimates by 5-10% anyway, I should actually get a more accurate reading!
Actually it doesn't...
Using the dyno I checked the speed and it was very accurate!
60km/h on the dashboard was something like 59.5 km/h real...
 

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My '07 Z has a stock 15 tooth in the front, with a +3 43 tooth in the rear. After racking up miles I didn't get to enjoy I decided to put on a SpeedoHealer a week ago. The gear change made it 7.3% faster reading. HealTech states 5.5% OEM speedo error. So I set it up for 11.8%- and went out and tested it with a radar cop. It was right on at 40, 45, 50 mph. I think I did a post somewhere around here??
 

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hey man, was reading thru these gearing pages and stuff and saw you wanted to go to a 16 front and 41 rear, did you do it? if so how do you like it? still enuf power to pull the front end up whenever? i just ordered a 39/16 combo, i cruise more than rip around town. thanks in advance.
I have heard a lot of good about just going to a 16 tooth front from others. I plan on doing this myself just to bring the rpm down a little since I am moving to Germany in 3 months and don't want to be on the Autobahn doing 90-100mph and pushing 8000 plus rpm.
 
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