If jetting alone does not achieve the top end range you are looking for you may consider some other options, such as 1) FMF fatty or PC expansion chamber 2)less pre-load on the power valve 3) exhaust port height/base gasket thickness
All of these options will have an affect on where the bike is making power, but with the 300 you may find that giving up a little on the bottom end of the power curve for faster revving/more over rev is worth it.
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