[jhv48]

First of all, those heat shields won’t do much to insulate your carbs from engine heat. If you have the hood clearance, try a 1/2” phenolic spacer under each carb. Should help quite a bit with the percolation problem. Also, open the hood after a long ride and leave it open if you can. All that heat can really build up after a run if you leave the hood closed.

Also, I believe the larger of the two capped nipples on the base of your carb will accommodate a pcv hose from one of the valve covers if you choose to install a pcv valve.

Now, as for the acrid smell, do your eyes burn too?