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This is a shot in the dark but have you checked the gas cap? Sometimes the vent gets clogged in the gas cap and so it doesn't release the gas into the carbs fast enough thus bogging down at higher speeds. Do you also stall a lot? This is also indicative of poor venting through the gas cap. Try riding the bike with the gas cap open and see if the bike improves. It's a simple test and won't cause you hundreds of dollars. If it fixes the problem then you're going to kick yourself for paying all that money in the first place. Story of my life.
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