If the powervalve is stuck open you'll see it when you take the cover off. The bike will run like and old school 100 in that it is all topend power.
Conversely if it is stuck close it won't wind out beyond the mid range.
FYI the 06 runs a YZ125 setup for powervalves so parts are easy to get.
If you don't mind could you tell me what jetting you are running? I'm having a devil of a time getting mine sorted and it looks like we are running the same pipes (Messick).
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