3CL headstock bearings

[Hambo]

Does anyone know the size of the top and bottom bearings in the headstock please?

cheers.

 

[Davo]

Steering head, top bearing, ball bearing, 6205VVCM NS7S
Steering head, lower tapered roller, 30205.

 

[mauricejota7604]

Here is another question is the shim neccessary beneath the outer lower race in the frame?
M.

 

[Grant]

I just did the head bearings in a 1200 here and it had 2 shims above the bottom bearing and one below the top bearing.
By the state of them it had been done in the factory.
Without shims sometimes the yokes can grate on the headstock tube.
Maybe it was a quick fix for poorly machined yokes?

 

[sfcpiet]

The shims locate the bearings in the correct height within the headstock... so yes, they are necessary, top AND bottom!

piet

 

[Hambo]

That was quick! Thanks guys.

 

[mauricejota7604]

How thick are the shims??

 

[tom3c75]

Just measured up a shim taken from a Ricambi Originale packet:

Thickness 1.55mm thick
OD 51.5mm
ID  40.0mm

The shims are not flat, but slightly convex/concave.