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Author [ES] [MY] [PL] [PT] [IT] [DE] [FR] [NL] [DK] [NO] [GR] [TR] Topic: Changing sprockets  (Read 13004 times)

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Online ras

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Re: Changing sprockets
« Reply #100 on: June 07, 2019, 03:13:59 PM »
*Originally Posted by Rolltide97 [+]
I've done a few changes on mine and the speedo stayed about 4 mph off the whole time, no difference.

it has been posted that gearing changes have no effect as the speedo is based off of the rear

Offline noext

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Re: Changing sprockets
« Reply #101 on: June 07, 2019, 03:15:47 PM »
*Originally Posted by ras [+]
it has been posted that gearing changes have no effect as the speedo is based off of the rear

ok very thx !

Offline T Bigbee

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Re: Changing sprockets
« Reply #102 on: June 07, 2019, 09:18:54 PM »
I have a 2019 model and swapped out the stock 15/44 sprockets (2.93 gear ratio) for the 17/41 (2.41 gear ratio) and liked it alot but felt it was too mild. Swapped the front sprocket to 16 (2.56 gear ratio) and thought that was just right and then it threw the 25 code after about 200 miles.  I am going to put the 15 back on (2.73 ratio) and see if the code will clear. I am glad I searched the forum when I did as I had pulled the covers and started troubleshooting the gear sensor wiring harness. Is there any option to reprogram the ECU for changes such as these? If we had a Kawasaki Diagnostic System could it be done?

Offline Scim77

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Re: Changing sprockets
« Reply #103 on: June 08, 2019, 05:23:31 PM »
T Bigbee.   Kawasaki Technical in the UK did not know of any possibility of reprogramming the ECU to accept sprockets changes. From my own experimenting, I can confirm that 16T front and 44T rear seems to be tolerated by factory mapping, without throwing up code25 fault, so that might be as far as we can go. Anything more radical will trigger fault code 25.
If you have not got a compatible OBD2 reader, then you will need to do a reset by using the "3 heat cycles over 40 mph" method that I outlined in another post called "Erasing fault codes"

https://www.z900forum.com/index.php/topic,2733.0.html


Who in their right mind would design a vehicle that falls over when it stops?

Online zed9

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Re: Changing sprockets
« Reply #104 on: June 08, 2019, 06:12:38 PM »
Then there is the "even tooth count" thing with the countershaft sprocket/rear sprocket which causes faster sprocket/chain wear.

I believe the "Gearing Commander" site has the calculator for it.

Offline T Bigbee

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Re: Changing sprockets
« Reply #105 on: June 08, 2019, 07:56:39 PM »
Scim77, I am still going to try the 15/41 set up, it yields a 2.73 ratio which is close to the 16/44 which is 2.75. However I need to get the code reset. The Kawasaki service manual I purchased describes the process to reset with the three cycles but it specifies over 25 mph ,which is about 40 kph, however that is a pain in the ass. Does anyone know of a compatible OBD2 reader one can purchase? I have one for my car and truck, if the motorcycle uses industry standard OBD2 protocol then a properly wired adapter cable could be use, ever hear of such a thing?

Offline T Bigbee

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Re: Changing sprockets
« Reply #106 on: June 08, 2019, 08:21:31 PM »
Scim77, I searched the forum and found out how to adapt my OBD2 reader to work on the Z. I love this Forum!

Online zed9

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Re: Changing sprockets
« Reply #107 on: June 08, 2019, 10:34:18 PM »
*Originally Posted by T Bigbee [+]
Scim77, I searched the forum and found out how to adapt my OBD2 reader to work on the Z. I love this Forum!
T, care to let us in on it?  :084:

Offline petrorabbit

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Re: Changing sprockets
« Reply #108 on: June 09, 2019, 03:21:53 AM »
*Originally Posted by zed9 [+]
T, care to let us in on it?  :084:

I'm interested also

Offline ksimon

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Re: Changing sprockets
« Reply #109 on: June 09, 2019, 04:33:40 AM »
As it happens I know a video. To adapt a obd2 to the a Z900