This valve shim kit is excellent. I couldn't believe all the shims included. All shims nicely marked with the size, and they mic'ed out to what they said. Did a quick job of shimming one valve was to go race, but now I have all the one's to do a better job with soon.
Wiseco Valve Shim Kit
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These installed in my '06 Yamaha FZ1 very well. Buying the kit is way cheaper than buying individually, especially since you might need a different one than you though. Trust me, but a kit!
The OEM parts do install a little easier though, as they have a very slight edge break, whereas these parts don't and don't fit into the valve quite as easy. Still work fine.
if you ride its a must