Do you hear any noise when the engine is running. It will either have to do with something on the primary side or the hydraulic clutch upgrade. How does the clutch feel? If it feel normal than the primary side is where you may want to start.
Is the drive belt still good? I know you probably checked it but I thought I ask.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.