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What is the bike doing that leads you to believe it is low on top-end power? Other than the recent valve check, do you have a service history on the bike? Has the bike had a thorough service other than just the valve check—new plugs and air/fuel filters, fresh fuel with a dose of BG-44 injector cleaner from NAPA, inspection/testing of plug wires, etc? Has the large branched vacuum line running from the throttle bodies down to the crankcase been checked for cracks or breakage? More info might get you a more targeted set of suggestions for things to check.
Best,
DeVern