Primary, secondary reduction ratios.

Becker
Topic Author
Offline
User
Registered
The Doctor Will Rise Again
Posts: 384
Thanks: 1

Primary, secondary reduction ratios.

24 Dec 2008 10:01

So I'm trying to make a spread sheet that will give a ground speed for a given engine RPM. My question is what is this Primary reduction ratio that is listed in the KZ model history. is that the reduction from the crank to the primary shaft?? Any help is much appreciated.

78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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

CoreyClough
Offline
User
Registered
GPz550 Addiction
Posts: 1094
Thanks: 82

Re: Primary, secondary reduction ratios.

24 Dec 2008 10:28

#254487

There are programs already out there for gear charts that might help you with this:

www.GearingCommander.com

and if you have Excel on your computer:

www.cunnington1.freeserve.co.uk/gearing_v12.xls

'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp

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

Becker
Topic Author
Offline
User
Registered
The Doctor Will Rise Again
Posts: 384
Thanks: 1

Re: Primary, secondary reduction ratios.

24 Dec 2008 11:26

#254496

Alright got it thanks.

78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport

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

bountyhunter
Offline
User
Registered
Posts: 7245
Thanks: 338

Re: Primary, secondary reduction ratios.

24 Dec 2008 12:45

#254505

Becker wrote:

My question is what is this Primary reduction ratio that is listed in the KZ model history.

My manual says 57/23 for my 1979 KZ750.

Becker wrote:

is that the reduction from the crank to the primary shaft??

That was my understanding.

Then the reduction to the wheel is the sprocket ratios which was 16/38 (stock) for mine.

1979 KZ-750 Twin

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