Help please with tuning my bike

Well I bought a carb rebuild kit that will be here soon. Comes with new needle jet and seals, etc. so maybe that will help out. We'll see.

Any chance the valve springs could be causing this? Instant rev + vibration at small throttle openings all the way up to full throttle?

I rebuilt the top end a little over a year ago but the bike has less than 20 hours since then. I did not change out anything on the head as everything checked out well within specs including the valves, valve seats and valve springs. Can the springs just go out all of a sudden? I wouldn't think so but maybe some others have experienced this....

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