The shims are often available from Motorcycle shops on an exchange + $$ value.
Exhaust should be in the order of .010 to .012", I will check and edit accordingly. Try typing "18RG valve clearance" into Google, it will definitely be published on teh web.
I found I was having noise issues and it was a tight lifter (bucket), I adjusted it with wet and dry (#600 with WD40) and trial fitting until it was nice. Still works.
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