What does this "sound" to you? From my engine/carburetors

[cheappc]

[video=youtube;DK5NT660zHk]http://www.youtube.com/watch?v=DK5NT660zHk&feature=autoshare[/video]

if you go to 8:02 to 8:17 thats how my engine sounds when is bogging down?

I rebuilt the carburetors, I put new spark plugs in it, used those only for a few hours, what do you guys think is?

Thanks by the way..