Happy medium for sprocket sizes KZ900

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11 Jun 2014 09:19 #636147 by SeattleKZ
Happy medium for sprocket sizes KZ900 was created by SeattleKZ
I'm gonna put new sprockets and chain on my KZ900. I just put got the engine back together with APE 410 cams and MTC 1015 pistons. I'm running the stock tire sizes. I think I'd like to add a little top speed but not so much I can't jump off the line. What gear ratio would yield a nice rpm range at 70mph but still have some jump off the line?

I'm going to be using a 530 set up

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  • 4TheKZ1000
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11 Jun 2014 10:10 #636152 by 4TheKZ1000
Replied by 4TheKZ1000 on topic Happy medium for sprocket sizes KZ900
On my KZ 1000 I have tried these:

Sorry, these are 630 numbers on a 18" rear tire.

15 - 35 Stock on some bikes. Good for Hot-Street for built bike.
15 - 32 Stock on some bikes. I think this is a good combo for street - highway.
15 - 29 70 mph at 5000 Needs work / RPM to get out of hole on street. Great for hard launch slipping clutch. I have been 130 mph on this combo. Custom made sprocket.

14 - 35 Was way to high. 118 mph max at 9500 to 10,000 Real thrill to ride.
14 - 33 NO
14 - 32 Maybe?

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11 Jun 2014 10:19 #636154 by SeattleKZ
Replied by SeattleKZ on topic Happy medium for sprocket sizes KZ900
I'm considering a 18/40 and buying a 17 too to see how that works

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11 Jun 2014 10:41 #636157 by 650ed
Replied by 650ed on topic Happy medium for sprocket sizes KZ900
You may want to take a look at this site. Ed

www.gearingcommander.com/

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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11 Jun 2014 12:08 - 11 Jun 2014 12:08 #636164 by Kidkawie
Replied by Kidkawie on topic Happy medium for sprocket sizes KZ900
I went up one tooth from stock on the front sprocket on my Z1B. Still has boat loads of power and can cruise at 80mph no prob.

Watch chain clearance running o-ring 630.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125
Last edit: 11 Jun 2014 12:08 by Kidkawie.

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