1974 Z1A 900 front sprocket

With new sprocket and o-ring chain, which way should the front sprocket be mounted?? Picture 1 or 2 should go towards the engine... 

 

 

The shoulder ( pic 1 ) goes on the inside to space the wider o ring chain away from the engine cases.

Thanks for the quick reply 

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.

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 )
 

Maybe it'll help? Pic of that 1.5mm rear sprocket spacer sf4t7 mentioned.

Thanks asphalt900, pic of mine wouldn't do any good it's already installed  

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.

hardrockminer wrote:

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.