I know this is probably subjective, but I guess I was just expecting the sound of air moving. It almost has a metallic rattle to it. I'm going to try to upload a video.
https://youtu.be/AHVJ_s2n-Mg
It sounds like the wiring looms may be coming in contact with the fans.
I pulled the end off the hopper assembly this morning to find that #30 Plate, Fan Air Diverter was hanging on the #29 Inner Fan by one very loose 6-32 machine screw. The other machine screw/nut was rolling around in the bottom of the hopper assembly. 
A little background... I picked up this YS640 at ATBBQ yesterday and drove home to northwest Arkansas - so I suppose it could have come loose during transport. With that said, I bought a comp cart model... so I hope subsequent trips end with better results. 
During re-assembly, at least two of the self drilling screws wouldn't retighten - and I was being gentle with them (Klein nut driver). It has been my experience that those things just aren't made to take in/out. Hopefully this is the last time I have to get inside the hopper assembly.
Anyway, everything sounds great now: https://youtu.be/qgn5t0I_NBs
For our records, what is the serial number of your cooker?
Yoder_Herb wrote:For our records, what is the serial number of your cooker?
I will PM it this evening when I return home. The build date was around June 24. Thanks.
Yoder_Herb wrote:Please send us the serial number of your cooker.
Sorry, I was late getting home. Will send this evening.
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