To ride an NSR with the PV wired fully open is (for me anyway) very hard. You have to remember that with the stock system the valve isnt fully open until almost 12,000rpm.

Its a very slow and progressive movement.

You will be amazed just how much middle you loose as well as bottom by doing this. Far better, if you must, is to set the valve 3/4 open. This at least give you back some of the midrange with very little loss to peak power.
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If I have to take the carbs off once more...