Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1
  • 2

TOPIC:

Chain/sprockets 24 Jan 2023 09:11 #879223

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
Hello everyone, My old 750 4cylinders has a 13-33 sprocket (original).. I want to down low my Rpm at 100km/h and more…  does 14-33 or 13-30 seems to be a good compromise?! What are you suggest me to not lose my low Torque.. and does the 14 teeths can fit with the stock 630 chain without cutting the engine case !!!!!?? Thank you so much 
Attachments:

Please Log in or Create an account to join the conversation.

Last edit: by Street Fighter LTD.

Chain/sprockets 24 Jan 2023 10:53 #879226

  • gd4now
  • gd4now's Avatar
  • Offline
  • User
  • Denco where did you go?
  • Posts: 1047
  • Thank you received: 274
What is the current rpm's at that km/h? How much lower do you want rpm's to be? With a little math you can find what final ratio would drop it to where you want it. 

For example; lets say your bike cruises at 100 km/h / 4,000 rpm and has a final drive ratio of (33/13) = 2.54:1 - if you change to 33/14 = 2.36:1 or if change to 30/13 = 2.31:1 
Divide your current rpm at that km/h with the current final ratio.  Then multiply by the new ratio to get how much drop in rpm it will produce.
4000/2.54 = 1575  
1575 x 2.36 = 3715 rpm
1575 x 2.31 = 3638 rpm




 
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 11:51 #879227

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
Thank you.. I have difficulty to count that..  In my memory, the rpm was 6000 at 100km/h!!  My ratio in the manual says 2:53 

Please Log in or Create an account to join the conversation.

Last edit: by Maxbou92.

Chain/sprockets 24 Jan 2023 12:17 #879228

  • Wookie58
  • Wookie58's Avatar
  • Offline
  • Sustaining Member
  • Posts: 1440
  • Thank you received: 648

Thank you.. I have difficulty to count that..  In my memory, the rpm was 6000 at 100km/h!!  My ratio in the manual says 2:53 
6000rpm seem's high for 100kmh (62.5mph) so on that basis at 9000rpm it would max out at 150kmh (93.75mph) assuming it could pull the revs in top gear - is that all the 750's are good for ? 
1982 KZ1000 Ltd

Please Log in or Create an account to join the conversation.

Last edit: by Wookie58.

Chain/sprockets 24 Jan 2023 12:39 #879230

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
Yes I know thats high.. im pretty sure that the rpm at 100km looks like that..  I don’t really understand the rpm calculations 

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 12:45 #879231

  • Jeff.Saunders
  • Jeff.Saunders's Avatar
  • Offline
  • Vendor
  • Posts: 1286
  • Thank you received: 169
Have you counted the teeth on both the front and rear sprockets?  Or are you obtaining the 13/33 count from the manual?  It is not unusual for previous owners to change sprocket ratios.  You always want to confirm what is on the bike before changing ratios.
This email address is being protected from spambots. You need JavaScript enabled to view it.
www.z1enterprises.com

Z1 Ent on Facebook,

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 12:53 #879232

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
Yes they are 13/33 sprockets!!!
 

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 13:27 #879238

  • Nessism
  • Nessism's Avatar
  • Away
  • Sustaining Member
  • Posts: 6573
  • Thank you received: 2188
If you have the original sprockets and chain, you might want to upgrade to modern 530 parts.  They are better than the old 630 stuff in almost every way.
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 13:34 #879239

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
Can you tell me why the 530 are better than 630 parts ?

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 13:48 #879241

  • Nessism
  • Nessism's Avatar
  • Away
  • Sustaining Member
  • Posts: 6573
  • Thank you received: 2188
Lighter, smoother power transmission, from the smaller space between rollers, quieter, and a modern 530 chain will be far more durable than the old 40 year old 630.
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre, 400)

www.kzrider.com/forum/forum-index/faq-wi...owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 14:01 #879242

  • Maxbou92
  • Maxbou92's Avatar Topic Author
  • Offline
  • User
  • Posts: 62
  • Thank you received: 0
All right, and what lenght I need if my 630 is 120 links?! Same thing ?

Please Log in or Create an account to join the conversation.

Chain/sprockets 24 Jan 2023 14:33 #879249

  • Scirocco
  • Scirocco's Avatar
  • Offline
  • Premium Member
  • Never change a running system
  • Posts: 3661
  • Thank you received: 1682
Are you sure your 630 chain have 120 links or do you have a extended swing arm?!

rbracing-rsr.com/chainlength.html offers a chain length calculator.
 

Please Log in or Create an account to join the conversation.

Last edit: by Scirocco.
  • Page:
  • 1
  • 2
Powered by Kunena Forum