Don't know if you resolved this or not...but It sounds like a fan blade hitting something loose. Remove the shroud again, check it out and see if it makes the noise with it off.if not, remove
the start button, clean it up with some WD,cuz it could be stuck when you push it. I had it happen before on an earlier bike.
the start button, clean it up with some WD,cuz it could be stuck when you push it. I had it happen before on an earlier bike.