Shim under valve shim?

[Wellsy]

Took out and measured all my valve shims to adjust.
Underneath one of the shims was a thin disc shim.
The size of the shim was 2.41mm ,the small shim inside was  0.40 mm thick.
Should I replace this with one bigger shim (2.80) or leave it as the clearance is ok?

 

[beauchemin]

That's just strange, yet obviously effective.  I would be inclined to go to a single shim.  Especially since you already have it apart.  Unless you have to wait a week to get the shim and your riding weather is beckoning!

 

[breganzane]

Replace with a single larger shim and take a close look at everything else since some bodger has been at work there.  Try to measure the distance from valve tip to the collets. Bodgers love to shorten the valve tips to regain clearance and it can happen that the lip of your shim (technically a lash cap) rides on the collets which messes with your clearance figures and can cause the collets to dislodge and the valve to drop.