'O' Ring Chain on an early Z1A

[DogsbolloxofZ1B]

Just fitted a NOS 'O' ring chain to a Z1A and when tensioned correctly and spin the wheel by hand I can hear it clattering the heads of the caphead screws on the primary casing (behind front sprocket).
I seem to be having a senior moment The NOS front sprocket has a small land protrusion on one side and at the moment thats facing away from the rear casing and seems to fit correctly with a decent amount of thread protruding for the tab washer & nut. If I turn it around and give increased clearance for chain the amount of thread protruding doesn't seem enough.
I don't believe fitting the rear sprocket spacer 92026-108 is going to help matters either.
Anyone else had this problem? How did you resolve?

Mike

[Garn 1]

Dogs', I've found this situation when I use the available larger lock nut. When I reverted back to the standard nut and tab washer I can just fit the spacer in.
Note that, the protruding land goes to the back of the front sprocket, giving clearance.
RegardZ.

[wilsonsjw11]

Mike
The protrusion definately faces towards the transmission cover.
Rear spacer to be fitted with o-ring chain.
Cap head screws instead of original crosshead screws,are they standing too proud?
Whats the part number on NOS front sprocket?
I have NOS Z1B sprocket if you need it.
Regards
Steve

[DogsbolloxofZ1B]

Garn & Steve,
Thanks for the info, confirms what I thought and I'll fit that spacer behind the rear too.

Steve,
I'll check the sprocket tomorrow eve and get back to you.

Mike