Loosing power at 6000 RPM 1985 Suzuki gs550?

taz

New member
I recently took my bike to shop did a carburetor rebuild and changed the spark plug, before I would easly be on 70 MPH at 6000 RPM, after the change of spark plugs and carburetor clean up, it goes up to 6500RPM barely gets 70MPH and feels like it losses power, its take up top 7000RPM to be on 75-78MPH, can somebody let me know what could be the problem?
Thank You
 
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