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Grinding Valve Shims - Opinions?

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bpreynolds:
Working to get within tolerance on the TBird Sport I recently acquired; they are shim/bucket type with several too tight.  The shims are 25mm around and I need to get a couple down in thickness from 2.70 to 2.60 or so.  I am just now finding how surprisingly challenging it is to get these locally as I've checked nearly every bike shop within city limits, all to no avail.  You'd think motorcycles don't even use them, so few around.  I've tried all local stores and nobody has size I'm needing.  Though nowhere near as divisive as an oil thread, on the Triumph board some reputable guys claim it is just fine to have a machine shop grind and buff them down to spec (then put in bucket with ground side down) while others advise not to do this.  What are opinions here?  I may just go ahead and have these ground, but then order them as per size and then swap them out the ground ones when the untouched ones arrive.  But maybe I don't even need to do this?

dilligaf:
I've done it on Ducaties.  Not sure it was worth the effort.  :BEER:
Matt

rocker59:
Good example of why I just mail order most things I need, these days.

You spend an afternoon of your time going to shops all over your area for something simple, only to come home empty-handed.

This happens to me all the time on the simplest of things.  Moto and non-Moto things.

I'd mail order some shims, if it was me.  Then you'll have some back stock on the shelf for next time, because your local sources still won't have them!

Wayne Orwig:
Nobody on the board has a source to buy them?

No reason what a good shop couldn't grind them, but it sounds like a hassle.

dilligaf:
Here you go.
So onto the web to find what else uses 25mm shims
Honda CB750, CB900, CB1000, CBX
Yamaha FJ1100,FJ1200
Older V-Max
Ventures and some older Toyotas.
Just shouldn't be all that hard except we no longer have motorcycle dealers.  We do have department stores that have motorcycles as part of the mix.  :BEER:
Matt

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