Has anyone machined valve shims (or had machined) to a new (thinner) thickness? How about has anyone used shims that have been machined? Any thoughts on the matter?
I know that at least a couple of Triumph riders have had their 25mm valve shims machined which are the same shims used by our V4 Yamaha engines.
I see one valve & heads tool maker makes tools specifically for doing this ($500 tools).
What I'm thinking about is possibly buying some used automotive 25mm shims at a good price if machining them to usable sizes is possible.
This would also allow me to fabricate shims of sizes that aren't normally commercially available. (they are normally only available in .05mm increments).
Only one side of the shims would be machined and that side should be placed down in the bucket, allowing the cam to ride on a origonal side/surface.
Last thought. How much would/should a machine shop charge for this service?