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82 gs550 katana high rpm misfire

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    82 gs550 katana high rpm misfire

    runs great until around 6k. in any gear. then it seems to misfire and lack the ability to accelerate like it should. It has new carb boots, air filter, recent valve adjustment, carbs professionally cleaned, v&h 4-1, jetted for the pipe. it will rev up to redline fine in neutral. but on the road, it will climb to 6/7k pretty fast and misfire all the way up to 9k. any ideas? new plugs as well. new battery. coil relay mod done and didn't help. running the engine on PRI with the vacuum line sealed off since my petcock is bad.
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