KZR's Bikes of the Month for 2024

1974 Z1A 900 front sprocket

  • increasing
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04 Feb 2024 09:56 #894823 by increasing
1974 Z1A 900 front sprocket was created by increasing
With new sprocket and o-ring chain, which way should the front sprocket be mounted?? Picture 1 or 2 should go towards the engine... 

 

 

increasing :)
1976 Kawasaki KZ900-A4, 1974 Kawasaki Z1A 900, 1987 Kawasaki GPX750R

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04 Feb 2024 10:03 - 04 Feb 2024 10:04 #894824 by zed1015
Replied by zed1015 on topic 1974 Z1A 900 front sprocket
The shoulder ( pic 1 ) goes on the inside to space the wider o ring chain away from the engine cases.

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Last edit: 04 Feb 2024 10:04 by zed1015.
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  • increasing
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04 Feb 2024 10:53 #894826 by increasing
Replied by increasing on topic 1974 Z1A 900 front sprocket
Thanks for the quick reply 

increasing :)
1976 Kawasaki KZ900-A4, 1974 Kawasaki Z1A 900, 1987 Kawasaki GPX750R

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19 Feb 2024 15:46 #895447 by Kidkawie
Replied by Kidkawie on topic 1974 Z1A 900 front sprocket
They sell spacers for the front and rear sprockets.  I went up one tooth on the front and needed to add one (with o-ring chain).  IIRC, the spacers on the rear are stock for 75.

1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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19 Feb 2024 21:47 - 19 Feb 2024 22:25 #895453 by sf4t7
Replied by sf4t7 on topic 1974 Z1A 900 front sprocket
If you're changing the rear sprocket on your 74 Z1A for the 530 o ring chain, you'll need the 1.5mm spacer for the rear sprocket to match the step on the new front sprocket. The 75 Z1B came from the factory with an o ring chain and the required spacer, also a revised lower left engine mount for clearance to the o ring chain. ( p/n 92026-108 and p/n 32030-046 )  The revised lower mount used a 36mm long bolt in the bottom hole ( 40mm long on the 74 )
 


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion
Last edit: 19 Feb 2024 22:25 by sf4t7.

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20 Feb 2024 03:00 #895455 by asphalt900
Replied by asphalt900 on topic 1974 Z1A 900 front sprocket
Maybe it'll help? Pic of that 1.5mm rear sprocket spacer sf4t7 mentioned.
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20 Feb 2024 04:49 #895458 by sf4t7
Replied by sf4t7 on topic 1974 Z1A 900 front sprocket
Thanks asphalt900, pic of mine wouldn't do any good it's already installed  


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion

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20 Feb 2024 08:13 #895463 by hardrockminer
Replied by hardrockminer on topic 1974 Z1A 900 front sprocket
There was one more mod by KHI (not yet mentioned) when they switched to O ring chain, and most people aren't aware.  The chain guard on Z1B's is a bit wider.  From memory it's 41 mm compared to 38 mm for earlier Z1 versions.  If you run an O ring chain on the earlier bikes you will likely have damage to the chain guard.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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20 Feb 2024 08:33 #895464 by Cra-z1
Replied by Cra-z1 on topic 1974 Z1A 900 front sprocket

There was one more mod by KHI (not yet mentioned) when they switched to O ring chain, and most people aren't aware.  The chain guard on Z1B's is a bit wider.  From memory it's 41 mm compared to 38 mm for earlier Z1 versions.  If you run an O ring chain on the earlier bikes you will likely have damage to the chain guard.
Maybe if you're running the 630 chain. I would recommend using the 530 conversion now days. I run a 630 0-ring chain on my 73 with out problems but will change that out to a 530 at some point. Chain technology has come a long way since the 70's and the 530 chain is more than sufficient.

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