Pulsing/Surging Bike

[WJTED1]

Hello,

For the last month I have noticed my bike "pulses" or "surges" as I accelerate. It is more noticeable at slower speeds then dissipates at higher speeds but I can still here a uneven noise from the engine. I hope this explains it. It's very consistent, it doesn't come and go. I am wonder if this could do with the tire or maybe even a bent hub? Thanks to all for your time.