chatter

I’m positive the chatter noise is coming from my carb I’ve stripped it down and can find a few potential suspects. So... Should the needle move at all in the slide?? Should slide have 4 identical wheels? One of mine is different to the other 3 and also comes away from the slide Lastly...

[youtube:39kkz9lu]http://www.youtube.com/watch?v=n6kOtuqrtT0[/youtube:39kkz9lu] i set the valves after this video and the chatter is better, i also checked the timing chain tensioner and it seems to be functioning properly. i'm pretty new to the thumpers so i'd like some experienced opinions...