Shim under bucket valves tend to tighten up with wear....however, carbon deposits from crappy gas and low rpms can make them loose. If you find loose valves you should run some combustion chamber cleaner through the engine before you swap shims out. Something like Yamaha Ring free or Mercury Marine Engine Tune or Sea Foam.
Tight valves need re-shimming.
I used to be fast....now I just dream about it.
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'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit) restoration project, '71 CB100 "Lil' Red", '73 RD350B (Orange Bird) restoration project, '08 TT-R110 (Buster) Pam's ride, '05 TT-R230 (Dirty Girl), 2015 Indian Chietain (Rita) my "low-n-slow".