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That sound/feeling is what happened to my friend's bike when his air box boots let loose from the carbs. We could get it to redline at partial throttle, but as soon as we used WOT, the sound/wimpy feeling kicked in right around 9-10k every time.
Can you reproduce this effect at a lower speed? Say, WOT in first gear?
If you are using carbs that are clean and are jetted the same as always, I'm failing to see how this can be a carb issue; carbs are simple things that have very few moving parts...
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