Dynobob wrote on 12/31/69 at 16:00:11:I think the consensus on this board is that removing the white spacer will give you an overly rich midrange. I think with a free flowing muffler (Supertrapp, Raask, Jardine, and Mac, Screaming Eagle) , 1/2 spacer is perfect. If stock or running a not so free flowing muffler (stock Harley), maybe removing 1/3 of the spacer (run one that is 2/3s the thickness of stock). Going up one size on your pilot jet will also alleviate some of the popping.
I completely agree!
I have stock exhaust, intake, and jetting and removed my white spacer for lean running surge, especially at cooler temps, and it runs great now with no complaints. (Except my mpg has dropped from high 60's to mid-50s)