Looking for 37T 630 Rear sprocket for 74

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24 Oct 2024 15:24 #905415 by shifterkart26
Looking for 37T 630 Rear sprocket for 74 was created by shifterkart26
Looking for 37T 630 Rear sprocket for 74 Z1. Looked everywhere with no luck. Any suggestions? Thank you!

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26 Oct 2024 07:45 #905472 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic Looking for 37T 630 Rear sprocket for 74
If the end result is simply lower overall gearing, a 14T front sprocket will probably be easier to find.  14T front sprockets were a very common mod in the day, and 14/35 will result in very similar gearing compared to 15/37.

Good Ridin'
slmjim & Z1BEBE

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A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

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26 Oct 2024 10:52 #905476 by shifterkart26
Replied by shifterkart26 on topic Looking for 37T 630 Rear sprocket for 74
Thanks. This is actually a restoration of a great friends prized possession of all the bikes he owned. After he passed, I decided to take this project on. I am just wondering if this isn't a 77 KZ1000 sprocket. They improvised a lot back in the day. 

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26 Oct 2024 12:40 #905480 by TexasKZ
Replied by TexasKZ on topic Looking for 37T 630 Rear sprocket for 74
Could easily be an aftermarket piece that is NLA.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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26 Oct 2024 12:58 #905482 by urankjj
Replied by urankjj on topic Looking for 37T 630 Rear sprocket for 74
Try this place. They show one available for a 74 Z1 630, it may be a custom order but they do show a price for it. I also have that same sprocket currently on my 77 KZ 1000 A1, fyi. Good luck....
sprocketspecialists.com/product/rear-sprocket/
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26 Oct 2024 13:31 #905489 by Injected
Replied by Injected on topic Looking for 37T 630 Rear sprocket for 74
Does it have a custom sprocket on it now?

Kawasaki lists it as being 35T



JT also lists it as 35T or optional 33T

www.jtsprockets.com/catalogue/model/s1691/
 

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26 Oct 2024 20:36 - 26 Oct 2024 20:40 #905505 by shifterkart26
Replied by shifterkart26 on topic Looking for 37T 630 Rear sprocket for 74
urankjj  Does your 77 have this part number on it?
true
Last edit: 26 Oct 2024 20:40 by shifterkart26. Reason: Correction

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27 Oct 2024 05:31 #905506 by urankjj
Replied by urankjj on topic Looking for 37T 630 Rear sprocket for 74
Negative, mine is a after market sprocket from that company, "sprocket-specialest", and it is 630 pitch, 37 tooth. Also it was purchased back in the early 90's, so I quess they've been around a while. 
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27 Oct 2024 08:13 - 27 Oct 2024 08:19 #905510 by Injected
Replied by Injected on topic Looking for 37T 630 Rear sprocket for 74
From that PN in the posted picture I was able to confirm its aftermarket and Portco brand.

Check current Ebay item 145908768603 and 202042018158

Probably much easier to replace it with a 35T unit.
Last edit: 27 Oct 2024 08:19 by Injected. Reason: info
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28 Oct 2024 21:12 #905545 by Scirocco
Replied by Scirocco on topic Looking for 37T 630 Rear sprocket for 74
A 33 or 35 tooth rear sprocket is more common and easier to buy.
It´s also gives you more speed and mpg, indepandent of your R.I.P friends solution, just my 2 cents!
For a faster acceleration go and get an other +100 hp bike.
Trust me, i could do it street legal on the highway here in Germany but no longer need it anymore, due to the stupid handy controlled zombie remote driver on the roads! But this is an other off topic story......

 
 

 
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29 Oct 2024 06:55 - 29 Oct 2024 07:10 #905554 by shifterkart26
Replied by shifterkart26 on topic Looking for 37T 630 Rear sprocket for 74
  • Scirocco This Z1 is special and will remain as it was built. But to your point, my other bike is well over 100hp and has many hp upgrades.   
Last edit: 29 Oct 2024 07:10 by shifterkart26.

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29 Oct 2024 07:25 #905555 by Wookie58
Replied by Wookie58 on topic Looking for 37T 630 Rear sprocket for 74

  • Scirocco This Z1 is special and will remain as it was built. But to your point, my other bike is well over 100hp and has many hp upgrades.  
I am confused, I understand why this bike is special to you and it is admirable that you have taken it on "out of respect" for your friend. What I find confusing is, if you want it to remain "bone stock as it left the factory" then why are you looking for a non-original sprocket/gear ratio ?
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