Z1a (August 73 build, USA)

[Adrian90s]

Hi guys,
Need a little help if at all possible.
Starting on the rear of my bike, after the humour of getting it on the centre stand.
Rear wheel off and at once noticed 3 stalks on the rim, one being the tube inflator, what's the other 2?
What date is the rim or is it now scrap with 3 holes in it?

The hub lining has a max, once again scrap if exceeded?
Do you change the rubber crush bushes as a matter of course?

[Adrian90s]

Wrong side of wheel hub....

[engz1b]

the other 2 stalks on rim are for wheel rim locks,

[Adrian90s]

What's a rim lock? Is it a 1975 rim also?
Thanks

[Garry.L]

What's a rim lock?
Thanks

They're to stop the awesome power of the 903 motor from spinning the wheel rim inside the tyre...

[Adrian90s]

Rim locks...what are they connected to inside the tyre?

[8 Valve Mark]

they're held in place by the pressure of the inner tube against them and the nuts you can see on the wheel rim . they're like this..

1546099194156172466464.jpg

[Adrian90s]

Thanks for that..is my rim original to the bike?

[8 Valve Mark]

i think the code is a feb 75. someone will confirm or correct this......

[Adrian90s]

Many thanks...no good for my 73 bike then. Anyone got a 3c-f to swop?
Or I can sell the rim, no rust on the rim...or the bike come to think.

[Philippe]

Hi guys
all said above is correct to my best knowledge. The two extra holes in the rim are for the tire grippers, 5B is the date code: februari 1975.
Max 200 mm states the maximum diameter of the space for the rear brake . The interior of the hub has a steel lining. If this is worn out you can't use the hub in a safe way, it could crack when it's hot due to the friction of the brake shoes when applying the rear brake.
So don't worry, I never saw a worn lining on a rear brake. Remove the rust and use new brake shoes.
GrtZ
Philippe

[Adrian90s]

Many thanks Phillipe,
As usual a clear answer, can I reuse the 6 rubbers?
Thanks

[ZedHead]

can I reuse the 6 rubbers?

If they fall out of the hub they are worn and should be replaced.

[Adrian90s]

Only when I bounced the wheel off the ramp did 2 fall out.

[gpjes]

The cush drive rubbers ,if they look ok you can reuse however if they've got lumps off treat to new, though can be a right beeatch to get wheel back in when new